The GED test was originally developed in 1942. Two primary reasons for developing the test were the number of American men being sent overseas to fight in World War II before they could complete their high school education, and the number of people leaving school early to join the largely industrial work force.
In 1972, a new series of the test was released. While the test designed in 1942 was adequate for a time period in which most jobs were industrial and required no education beyond high school, the marketplace in the 1970s required a broader understanding of academic subjects. The new series addressed this issue, and also better prepared students for education beyond the high school level. The 1972 series also required more critical thinking than the 1942 edition, which mainly required the student to recall general facts.
The series was revised for the third time in 1988. The most noticeable change to the series was the addition of a writing sample, which had never been required before. A greater emphasis was placed on socially relevant topics, and more problem-solving skills needed to be demonstrated. For the first time, more students (65%) were taking the test to continue their education beyond college than to get better employment (30%).
The GED series currently used is the 2002 series, which is considered to be the most challenging series so far. More business-related topics are covered, and the test contains more questions and written passages relevant to adults. Although students are not required to perform a scientific experiment, they must explain how to conduct one, interpret results, and apply information gathered. Written passages are also more multicultural, reflecting the large number of immigrants taking the test.