A review of previous research has failed to demonstrate that a family life-cycle model is a viable theoretical framework for investigating and understanding patterns of change in marital satisfaction or discord in the American family. (Author)

The implications of a mathematical model of test scores are explored where the data are limited to a random sample of items without replacement from an indefinitely large population or item domain in which items are scored either zero or one. The purpose is to obtain an unbiased estimate of a student's proportion of items correct in the item…