The subject headings in your library's catalog and periodicals indexes will give you helpful ideas about how to limit your subject. For example, under the subject heading “parenting” in the book file were several related headings, such as “moral and ethical considerations of parenting” and “stepparenting.” In addition, there was a list of seventy books, including several titles that suggested limited directions for research: parents and discipline, parenting and adolescent girls, how parents can protect their kids from violence. Under the subject heading “Parenting” in the library's periodicals index were subheadings and titles of many articles that suggested additional limited topics: how parents can limit the impact of TV on kids, keeping the lines of communication open between parents and teenagers, and secrets to raising a successful teen.