1. What does population growth rate measure? [Population growth rate (PGR) is the increase in a country’s population during a period of time, usually one year, expressed as a percentage of the population at the start of that period. It reflects the number of births and deaths during a period and the number of people migrating to and from a country.]
2. If you wanted to get an accurate picture of population growth trends in a country, would you look at the average annual growth rate for a single year, or for a period of years? [a period of years] Explain why. [Looking at growth rates over a period of years helps to counteract any uncommon short term events that might give an inaccurate picture of population trends. For example an epidemic, famine, or war could cause a significant drop in PGR one year, but the change would not be due to any long term shift in people’s behavior, and therefore would not be as pronounced if looked at over a 10 or 15 year period.]  

2. Answer each of the following questions briefly, referring back to the text if necessary.

1. Why have death rates and birth rates declined? [Death rates have declined largely because people have more access to better health care and better nutrition. Birth rates have declined because parents are more confident that their children will live to adulthood; more people have access to family planning; and more girls are receiving basic educations, and are choosing to start their families later in life and to have fewer, healthier children.]
2. What causes population momentum? What are its consequences? [Population momentum occurs when a population consists of a large number of young people who are at childbearing ages. Because of their sheer numbers, and because they are having children, population in these countries continues to rise, even if they are reproducing at replacement fertility levels. As a consequence, population momentum does not allow the full effect of a lower PGR to be felt for several decades. The resulting larger population imposes additional demands on a country’s social services, economy, and environment.]
3. How might increasing urbanization affect environmental conditions in a country? [Increased urbanization can result in increased consumption of natural resources such as trees for lumber and fresh drinking water; more pollution which can affect air and water quality and can have a negative effect on health conditions, wildlife, and vegetation; more "crowding"; and fewer "green spaces".]
4. To what extent does migration between your country and others, or from rural to urban areas within your country affect your country’s economic, environmental, or social situation? [Answers will vary.]
5. What sorts of services and support can a government provide to its citizens that will help slow the population growth rate? Explain why you think these strategies may help. [Governments can increase education, especially for girls; offer better family planning services to more people; provide medical insurance, pension plans, and social security; improve health care and decrease infant mortality; and increase people's awareness of problems of rapidly growing populations.]
6. What might be some reasons why women with a basic education tend to have fewer children? [They may be more aware of family planning options; they have have probably learned about health, hygiene, and good nutrition, so more of their children survive; and they are better qualified to work outside the home and earn money, so they have more options in life and may choose to start families later and have fewer children.]

3. Calculate the annual population growth rate for countries A, B, and C using data provided in the table below and this formula: ^*

^* (Average annual population growth rates for a period of years provide a better picture than annual rates. For this reason, they are used in the Data Table. Calculating any growth rate for a period longer than a year requires more complicated mathematical formulas than the one used to calculate an annual rate.) 

4. Population growth rates are small numbers, but they have large effects on population. To see what this means, complete the following exercises.

1. Assume the world population at the beginning of 2000 was about 6 billion. If the projected 2000 average annual population growth rate for the world was 1.1%, how many more people would be added to the world by 2001. [66 million]
2. If the 2000 world population grew at .2%, the same projected rate as the United Kingdom, how many more people would be added to the world by 2001. [12 million]
3. If the 2000 world population grew at 1.7%, the same projected rate as Kenya, how many more people would be added to the world by 2001. [102 million]
4. Use your answers to questions 3a,b, and c to make a general statement about the relationship between population growth rates and the change in the size of a population. [Even small changes in population growth rates have a significant impact upon the size of the world’s population.] 

5. Use the calculations and data in the table below to calculate the birth rates, death rates, and population growth rates for three countries and fill in the missing information.

6. If a population growth rate is low, population is growing slowly. If it is high, population is growing rapidly. To understand what "slow" and "rapid" mean, it helps to look at how long it will take different countries growing at different rates to double their population.

1. The number of years it takes a population to double can be estimated by dividing the number 70 by that population's growth rate. Calculate the doubling time of populations growing at the rates shown in the key to the map. [Less than 1%, 70 years or more; 1% to 1.9%, between 70 and 36 years; 2% to 3%, between 35 and 23 years; more than 3%, less than 23 years.]
2. Is three percent a rapid growth rate? Explain. Is two percent a rapid growth rate? Explain. Is one percent a rapid growth rate? Explain. [Answers will vary.]
3. Use the projected population data in column 2 of the Social Data Table for 1998–2015 to calculate the population doubling time for these countries: your country, Canada, Chile, Finland, India, Zambia. [Canada (70/.6 = 116 years); Chile (70/1.1 = 64); Finland (70/.1 = 700) India (70/1.3 = 54); Zambia = (70/1.7 = 41)]
4. Assume that your country has an average annual population growth rate of 1.8%. It will take 39 years for your country’s population to double. What changes will your country need to make to deal with this growth in population? Consider such issues as housing, health care, food supplies, transportation, employment, education, and the environment. Do you think your country presently has the resources to handle this rate of population growth? Why or why not? 

7. What consequences might a declining population growth rate have on a country’s economy and environment? [This depends on a number of variables including the use of technology and the level of demand for goods and services. Smaller populations may require fewer natural resources, but if demand remains high, or if the country is able to export its surplus production, there may be no significant decrease in overall environmental impact. Slower population growth might allow a country to implement environmental policies and develop the institutions which can help protect the environment. A smaller population may mean that there will be fewer workers, and thus fewer goods and services (unless technology helps to increase production).]

1. According to the map key, what color represents countries with lower population growth rates? Where do these countries tend to be located? [Green, Europe]

2. What color represents countries with higher population growth rates? Where do these countries tend to be located? [Orange, Sub-Saharan Africa, Asia, the Middle East and South and Central America.]

3. Which continent has the largest number of countries with a high PGR? What assumptions might you make about living conditions there?
[Africa. Infant mortality rates are probably high; family planning services are probably not readily available; many children may not have the chance to attend school; people may not get enough to eat; health conditions may be poor; living conditions are probably not as good as in countries where people earn more money, and where the population is growing more slowly.]

4. Name and locate on the map three countries with population growth rates of more than 3 percent, three with rates of 2 to 3 percent and three with rates of less than 1 percent. To what extent are these countries typical of other countries in their regions? [Answers will vary.]

1. Calculate the percentage of the world population that lived in low-, middle-, and high-income countries in 1998. [60%; 25%; 15%]
2. Describe the general distribution of the world’s population among low-, middle-, and high-income countries. [There are twice as many people in low-income countries than in middle-income countries, and 85% of the world’s people—more than 4 out of every 5 people—live in low- and middle-income countries combined.]
3. Calculate the percentage of the world’s population that is projected to live in low-, middle-, and high-income countries in 2015. [62%; 25%; 13%].
4. Compare the percentages for each country income group and describe the change between 1998 and 2015. [The proportion of people in low-income countries is expected to increase, the proportion of people in middle-income countries is expected to stay the same, and the proportion of people in high-income countries is expected to decrease.] 

3. Use the Social Data Table to identify the five most populous countries in 1998 along with their populations, their regions, and their income groups, and fill in the following table:

1. Which two countries had the largest populations? [China and India]
2. To which income group did these two countries belong? [low income]
3. Which region had the most countries in the top five most populous nations? [Asia (South and East)]

4. Use the Social Data Table to fill in the population information for China and India in the following table. Next, calculate the percentage of the world’s population that is represented by China and India for 1998 and 2015 and add that information to the table. (Divide each country’s population by the world’s population and multiply the figure by 100.) Then answer the questions that follow.

1. Compare the population size of these two countries in 1998. How many times larger was China’s population than India’s? (Divide China’s population by India’s population.) [China’s population is about 1.3 times larger.]
2. Compare the population size of these two countries in 2015. How many times larger is China’s population expected to be than India’s? [1.1 times]
3. India has a smaller population base than China, yet the gap in their populations is expected to decrease significantly in the next few years. How can you account for this? [India’s population is growing more than one-and-a-half times faster than China’s.]
4. Add the projected 2015 populations of the two countries. What percentage of the world’s population will they represent? [(1389 + 1224) ÷ 7113 = 37%]
5. Given the population size projections of these two countries, in what ways might they play important roles in the world economy? In your answer consider China and India’s potential as producers and consumers, and to what extent this potential depends on the development of their human capital and the use of their natural resources. [Answers will vary. Possible answer: If the current and future workers have adequate access to health services, food, education, and training, they may provide a large capable workforce for the production of goods and services for their own countries and for export. They might also provide large markets for imported goods and services, particularly if selling their goods and services abroad gives the average person more money to spend (measured in terms such as GNP per capita). In the short run, however, rapid population growth in low-income countries tends to lead to lower GNP per capita, allowing fewer resources per person to be invested in human capital development—the key to improving labor productivity. Large populations can also place stress on the environment as natural resources can become depleted, and increased energy use and general consumption can increase pollution—all of which can eventually affect productivity. Two great challenges for China and India as the most populous nations in the world will be to develop labor forces that will be able to support their future populations, and to manage their natural resources so that they will have the raw materials to remain productive for generations to come.] 

5. In 1998, four out of every five people in the world lived in low- and middle-income countries. As this percentage increases, what might be some of the impacts on the global economy? On the environment? On peace and security issues? [Answers will vary.]

1. Look at the numbers for Pakistan. Although the average annual population growth rate decreased from 1980 to 1998, the annual population increase was greater in 1998. Why?[The population base was larger in 1998.]
2. What are the population trends in Ethiopia? [Both the population growth rate and population size have increased since 1980.]
3. What are the population trends in Ukraine? What would have been its total population in 1999? What might be some reasons for these trends? [The population is decreasing. 49,600,000. Possible answers: emigration, small families, political unrest, social insecurity, decline in health services.]

5. What effect might a declining population growth rate have on a country’s economy and environment? [This depends on a number of variables including the use of technology and the level of demand for goods and services. Smaller populations may require fewer natural resources, but if demand remains high, or if the country is able to export its surplus production, there may be no significant decrease in overall environmental impact. Slower population growth might allow a country to implement environmental policies and develop the institutions which can help protect the environment. A smaller population may mean that there will be fewer workers, and thus fewer goods and services (unless technology helps to increase production).] 

6. Why might a country not want to slow its population growth? [Possible answers: religious reasons; to increase its political influence; it has a large land area and plenty of resources; it has experienced a decline in population.]

1. Study the information in Chart 3.1 for low- and high-income economies in 2000. Then, answer the following questions about the population trends shown. 

1. In low-income countries, which age range(s) contained the largest percentage of the population? the lowest? [The highest: under age 30; the lowest: above age 50]
2. In high-income countries, which age range(s) contained the largest percentage of the population? the lowest? [The highest: between 25 and 50; the lowest: between 55 and 74]
3. In a brief statement, compare the age composition of the populations for low- and high-income countries for 2000. [In low-income countries, a large percentage of the overall population is under age 30, so the largest portion of the population is either in childbearing years or will soon enter childbearing years. In high-income countries, the largest segments of the population are middle-aged or older, and have either moved beyond childbearing years or will soon do so.]
4. Considering your answer to question 1c, what type of social programs might be important to meet the future needs of the largest age groups of each country income group? [Possible answers: To help care for and educate a young population, it might be important for low-income countries to invest in health programs for expectant mothers and children, family planning services, education and training programs, and housing. To help care for an aging population, it might be important for high-income countries invest in health services for the elderly, pension plans, and assisted living programs.]  

2. Study the information in Chart 3.2 for low- and high-income economies in 2030. Then, answer the following questions about the population trends shown. 

1. In low-income countries, which age range(s) contained the largest percentage of the projected population? the lowest? [The highest: below age 39; the lowest: above age 64]
2. In high-income countries, which age range(s) contained the largest percentage of the projected population? the lowest? [The highest: above age 50, particulary above age 75; the lowest: below age 25]
3. Compare the age composition of the populations for low- and high-income countries shown in Chart 3.2 with those shown in Chart 3.1. [In the 2030 projections for low-income countries, there is less of a pronounced difference between the old and the young groups than in 2000, but there is still a large percentage of the overall population in childbearing years. The population in low-income countries is stabilizing. In high-income countries, the largest segments of the population have moved beyond childbearing and have entered retirement years. The trends that were in place in 2000 have become more pronounced.]
4. Compare the gender composition for low- and high-income countries shown in Chart 3.2. with those shown in Chart 3.1. [In 2000, the percentage of men and women is roughly the same in both low- and high-income countries up to age 75 where there is a dramatic increase in the number of women as a percentage of the overall population in high-income economies This same trend continues for men and women in 2030.]

3. Read the definition of population momentum in the glossary. Using Charts 3.1 and 3.2as a reference, in which economic groups and years do you think this phenomenon exists? Why? [In low-income economies in 2000 and 2030. Because of the youthful age structure which is typical of developing countries in these years, population growth will not stop for several decades.]

4. Look at the shapes of the charts in Charts 3.1 and 3.2. What would a stabilized population look like? Explain. [It would be a rectangle, because the percentage of the population dying would be approximately equal to the percentage of people being born.]

5. What impact might population momentum have on the care of small children in a country where a large proportion of the childcare duties are performed by daycare centers? [Population momentum may cause childcare to become scarce or over-crowded because the size of the population needing the services could outnumber the size of the population able to provide the service.] What about a population where elderly relatives provide childcare? [Again, childcare may be difficult to find since the number of babies is so much greater than the number of older people available to take care of them.] Who are the caretakers of small children in your country? [Answers will vary.] What effect might population momentum have on these arrangements? [Answers will vary.]

6. What impact might an aging population have on the care of elderly people in a country where a large proportion of these people live in nursing homes or elderly housing? [An aging population may cause elderly housing and nursing home care to become scarce because the ever-increasing numbers of elderly people needing the services could grow to outnumber the portion of the population able to provide care.] How are elderly people cared for in your country? [Answers will vary.] What impact might an aging population have on this care? [Answers will vary.]

7. Match each of the following descriptions with the country below that illustrates the trend described.

1. The death rate is high, the birth rate is high, and there are a large number of children in the population. [Yemen]
2. There has been a sustained decline in the birth rate, but the proportion of the elderly population has not yet become large. [Korea]
3. The birth rate has been low for a long period, and the elderly proportion of the population is increasing. [ Italy]

1. How many countries have negative projected population growth rates? [23] In which region(s) are these countries located? [Europe and Asia]
2. How will a negative population growth rate affect the actual numbers of people in these countries? [The total populations of these countries will decrease between 1998 and 2015.]
3. What might be some benefits to a decrease in population? [Possible answers: The demand for social services, economic goods, and natural resources might lessen so that each person could have more. There might be less pollution.]
4. What are some potential problems if a country’s population is decreasing or growing too slowly to replace the number of people who die? [As growth slows, the average age of the population rises and eventually the proportion of elderly, nonworking people will increase. This can put great pressure on a country’s pension, health care, and social security systems.] 

2. Make a copy of the blank Comparative Data Table and label the first column Countries and the second column Population growth rate, 1980–98. (Note. The Work On Line version tables are already labeled.) Then using the text and the Data Tables, fill in the chart according to the following instructions:

1. In the column at the left of the table, write the following countries and their regions: Brazil (South America), Ghana (Sub-Saharan Africa), Philippines (Asia, South and East, and the Pacific), Egypt (Middle East and North Africa), Canada (North and Central American and the Caribbean), Russian Federation (Europe and Central Asia).
2. Read the definition of population growth rate.
3. Use the Social Data Table to find the average annual population growth rate for each country during 1980–98. Rank the countries with "1" equaling the lowest population growth rate and "6" the highest. Write the appropriate ranking number in parentheses after the data in column 2. Make a general statement comparing the population growth rates in these six countries.
4. Find each of the six countries in the world and regional map gallery. Compare the color of each country with those of its neighbors. To what extent is each country typical of conditions in its area and region? Make a general statement comparing the population growth rates in the six regions. 

3. Make a copy of the blank Comparative Data Table and label the first column Countries, the second column Population growth rate, 1980–98, the third column, Life expectancy at birth, 1998, the fourth column GNP per capita, 1998 and the fifth Access to safe water, 1990–96. (Note. The Work On Line version tables are already labeled.) Then using the text and the Basic Data Table, fill in the chart according to the following instructions. 

1. Choose a low-income country in Sub-Saharan Africa and one in Asia (South and East) and the Pacific and write their names in the first column.
2. Choose a middle-income country in each of the following regions and add them to the first column: South America, Europe and Central Asia, and Middle East and North Africa.
3. Choose a high-income country in North and Central America and the Caribbean, one in Europe and Central Asia, and one in Asia (South and East) and the Pacific and add them to the first column.
4. Label each country in your data table with an L, M, or H to show which income group it belongs to: low, middle, or high.
5. Read the definitions of population growth rate, life expectancy at birth, GNP per capita, and access to safe water. Go to the Basic Data Table, and for each of your countries find the 1980–98 population growth rate, 1998 life expectancy at birth, 1998 GNP per capita, and the 1990–96 percentage of population with access to safe water, and write this information in the appropriate columns. If data for one of the indicators are not available, select another country from the same income group and region.
6. Rank the countries, with "1" equaling the lowest population growth rate and "8" the highest. Write the appropriate ranking number in parentheses after the data in column 2.
7. Study your chart and answer the following questions:

• In the countries with population growth rates of more than 3 percent, are the other indicators high or low? [Answers will vary.]
• In the countries with population growth rates of 2 to 3 percent, are the other indicators higher or lower than in the countries with population growth rates of more than 3 percent? [Answers will vary.]
• In the countries with population growth rates of less than 1 percent, are the other indicators higher or lower than in the other countries? [Answers will vary.]
• Does population growth rate follow the same trend as the other development indicators in your chart? Explain. [Answers will vary.]

1. Look at the photograph. Describe what you see. [An elderly woman is reading to two children.]

2. Would this be a common scene in your country? Why or why not? [Answers will vary.]

3. In which country was this photograph taken? [United States]

4. Find the country in the world and regional map gallery. What region is it in? [North and Central America and the Caribbean]

5. Find the country in the Basic Data Table and determine if it is a low-, middle-, or high-income economy. [It is a high-income economy.]

6. According to the Basic Data Table, what is this country's projected population growth rate for 1998-2015? [0.8%] Its 1998 life expectancy at birth? [77 years] Its 1998 GNP per capita? [$29,240]

7. What do you think life is like for the average person in this country? Support your answer. [Answers will vary, but should take into account the possible effects of the population growth rate, the GNP per capita, and average life expectancy at birth on the quality of life.]

8. What, if any, aspects of the activity shown in the photograph might help improve living standards in industrial countries? In developing countries? [Possible answer: In both industrial and developing countries, older generations can help families with child care and education. In doing so, they can help to preserve the family's culture and values and can also help the family save money in child care expenses.]

9. Which sector of development (i.e., social, economic or environmental) is best represented by the photograph? [Social] Explain your answer. Is it possible for this photograph to represent other sectors as well? In what way? [Answers will vary.]

10. In what ways might the activity in the photograph encourage sustainable development? In what ways might it discourage sustainable development? Explain your answer. [Possible answer: Acknowledging and accepting the contributions that older people can make to family life allows people to still be productive when they are no longer able to work in the formal economic sector. They encourage sustainable development by providing stability to their families while making it possible for other family members to earn a living.]

1. Look at the photograph. Describe what you see. [Girls are working in a classroom.]

2. Would this be a common scene in your country? Why or why not? [Answers will vary.]

3. In which country was this photograph taken? [Mali]

4. Find the country in the world and regional map gallery. What region is it in? [Sub-Saharan Africa]

5. Find the country in the Basic Data Table and determine if it is a low-, middle-, or high-income economy. [It is a low-income economy.]

6. According to the Basic Data Table, what is this country's projected population growth rate for 1998-2015? [2.7%] Its 1998 life expectancy at birth? [50 years] Its 1998 GNP per capita? [$250] The percentage of its 1990-1996 population with access to safe water? [37%]

7. What do you think life is like for the average person in this country? Support your answer. [Answers will vary, but should take into account the possible effects of the population growth rate, the GNP per capita, and the percentage of the population with access to safe water on the quality of life.]

8. What, if any, aspects of the activity shown in the photograph might help improve living standards in industrial countries? In developing countries? [Since studies show that girls who are educated tend to have smaller, healthier families, girls' education can improve living standards in both industrial and developing countries. In addition, by having an educated labor pool, countries will be better able to support more of the higher paying, high-tech industries.]

9. Which sector of development (i.e., social, economic or environmental) is best represented by the photograph? [social] Explain your answer. [Answers will vary.] Is it possible for this photograph to represent other sectors as well? In what way? [Answers will vary.]

10. In what ways might the activity in the photograph encourage sustainable development? In what ways might it discourage sustainable development? Explain your answer. [Possible answer: When women have a basic education, they tend to delay marriage and take more time to find suitable husbands; know about and practice family planning; have more job opportunities; and lose fewer babies to childhood diseases and malnutrition, and as a result choose to give birth to fewer children. All of these outcomes tend to improve the social, physical, and economic health (and therefore sustainability) of a country. In addition, the resulting slowing of the population growth rate can lessen the stress placed on natural resources and the environment.]

2. Who attends the meeting? [There are about 15 women of varying ages. Some bring their children.]

3. Why do some people say that the village can support more people? [The village has recently built a number of improvements, including a corn mill, roads, and a new school. Some of the villagers feel that these additions should make it possible for families to have more children.] Why do other people say that the village cannot support more people? [Some villagers point out that the people in the village depend on the local land for growing their food. There are limits to the amount of food that can be produced on the available land, and overclearing and overworking the land can cause the soil to erode and to lose its fertility.]

4. How can spacing pregnancies help to produce a healthier, more economically secure family? [When there is time between births, babies and mothers tend to be healthier. In addition, parents have more time and resources to give to each child. There is more money per child for food, clothing, medical care, and education.]

5. What are some of the benefits mentioned for having large families? [A large family can be a sign of prosperity and status. Also, if a family has its own business or farm, children can provide the necessary labor. In addition, when the infant mortality rate is high, parents may choose to have large families to be sure that at least a few children will survive to take care of them in their old age.] What are some of the benefits to having small families? [In small families, the mother and children are usually healthier, and a greater percentage of the children live to adulthood. It is less expensive to feed, clothe, house, and educate a small family, so their standard of living can be higher. And when a generation dies, the family lands and wealth will be divided among fewer people, so each child’s portion will be larger. If an entire village has small families, there is less demand placed on local environment and natural resources.]

6. In Christy’s opening presentation, she discusses “responsible parenthood” with the women. If you were to give a presentation on “responsible parenthood”, how would you define the term and what topics would you cover? [Answers will vary.]

7. Christy tells the women that she works with the Ministry of Health. Why might the government want to slow population growth and encourage family planning? [Answers will vary.]

8. Vivian tells the group that some of the men “were angry that outsiders were trying to meddle in our private affairs.” To what extent is having children a private matter, a public concern, or both? Use examples from the case study and your own experience to explain your answer. [Answers will vary.]

9. At the end of the case study, Christy suggests that the group continue their meeting by talking about how to get more of the community, especially husbands, interested in family planning. What are some of the objections people might have to family planning? What are some of the reasons people might support family planning? If you were at this meeting, what strategies would you suggest to bring these two sides together? [Answers will vary.]

11. Look at the Social Data Table and find Cameroon. What is the projected 1998–2015 average annual population growth rate? [2.1%] How does this compare with the projected 1998–2015 average annual growth rate for your country? [Answers will vary.]

12. Is family planning an issue where you live? Explain. [Answers will vary.]

1. Choose the five activities that you would undertake first and rank them in the order in which you would implement them. Explain why you chose this ranking.
   • Start a campaign of posters, billboards, radio announcements, and newspaper ads that portray small families as desirable.
   • Have the Ministry of Health train more people to provide family planning services in rural health clinics and urban hospitals.
   • Design pre- and in-service training programs for medical personnel to teach them how to provide family planning services.
   • Contract with national celebrities in sports and entertainment to film public service ads in support of family planning.
   • Have the Ministry of Education develop a curriculum for secondary schools about population growth.
   • Provide financial incentives for parents to send their daughters to school.
   • Have the national university do research to determine how to persuade more couples to practice family planning.
   • Enact a law that will raise the taxes of couples who have more than two children.
   • Enact a law that will lower the taxes of couples who have two or fewer children.
   • Have the Department of Industries develop job training programs for women.
   • Use tax revenue to set up a social security fund so retired people will have a small but secure income.
2. Are there any activities listed that you would not use? Explain.
3. What are three additional activities that you would add to your list? Describe each one and explain how it would fit into your ranking.

2. This activity, which demonstrates how much family size can influence a country’s population, is designed to be done in class or with a group of people. If you are doing this activity by yourself, draw it out on a piece of paper.

1. Four members of the class form two couples. Couple A and their descendants will always have two surviving children; couple B and their descendants will always have three.
2. Couple A selects two members of the class as its children; couple B selects three members of the class as its children.
3. The children of couples A and B select members of the class as their spouses. The children of couple A and their spouses are couples C and D; the children of couple B and their spouses are couples E, F, and G.
4. Couples C and D each select two members of the class as their children. Couples E, F, and G each select three members of the class as their children. How many children altogether do couples C and D have? Couples E, F, and G?
5. Continue the activity through another generation (the fourth); members of the class already selected will have to be selected again. At the end of the generations, there will be eight children who are descendants of couple A and twenty-seven who are descendants of couple B.
6. What conclusions can you draw from this exercise?

3. Make a family tree by going back to your great-grandparents on both your mother’s and father’s sides of the family. To whatever extent possible, list the years in which people were born, were married, and died, as well as their occupations and levels of education. If you do not know all of the information yourself, interview other family members; older relatives are excellent sources. After your family tree is assembled, analyze the data you collected and answer the following questions to the best of your knowledge.

Note: Although one of the objectives of this exercise is to help you become more informed about your own family, if you are unable to collect information from your family, or if your family feels uncomfortable discussing this information, you can interview a neighbor’s or friend’s family instead.

1. Do your parents have as many children as your grandparents had? as your great-grandparents had?
2. Are there differences among the generations in respect to life expectancy?
3. Are there differences between the sexes in respect to life expectancy?
4. Did any of your family suffer from diseases that are preventable today?
5. Does your data suggest any relationship between life expectancy, occupation, and/or education level and the number of children people had?
6. How many children would you like to have? Does knowing your family history have any bearing on your decision? Explain.

4. People’s decisions about family size affect not only themselves, but also the other people they share resources with. This exercise helps show how changes in population size over time can affect the demand on public services and natural resources. The more information and the more types of information you can collect, the more complete picture you can make, so it is best to do this exercise with a whole class. Because some information may be difficult to find, you may have to settle for estimates, but estimates can still show trends.

1. Find out what your community’s population was ten years ago and what it is today. Has it grown or declined, and by how much?
2. With your class, make a list of the services and resources you and your family must share with other members of your community. (Some ideas may include: schools, roads, public transportation, water, sewerage systems, electricity, telephones, fuel, or parks.)
3. Break up into small groups, and divide the list equally among the groups. With your small group find evidence of how demand for your group's resources or services has changed over the past ten years. You may find that ten years ago, a particular service did not even exist, or that a resource that was widely used ten years ago is not around today. Try to gather information from a variety of sources, such as local government offices, interviews with older family members and neighbors, photographs, libraries, newspaper clippings and archives, and utility companies or coops.
4. With your small group, present your findings to the class in a short written or oral report.
5. As a whole class compare the findings with the population trends. As population has grown or declined, which resources and services have grown or declined with it? Which have not?
6. Individually, use the evidence your class has collected to write a short essay answering the question: If your community’s population continues to grow or decline over the next ten years as it has in the past ten years, what additional changes do you expect to see in the demand for resources and services? Is this change sustainable? Explain.