Even though Protheroe and Weinland's advice on interviewing techniques tells kids to be serious so adults will know you aren't just ""clowning around,"" polling grownups on their attitudes toward borrowing money, being a housewife or learning grammar is likely to be discouraging work. And the prospects for keeping a record of the use of superlatives, ""testing the knowledge of people about sports or some other activity by asking them to interpret headlines or column headings,"" and trying to convince the school board that buying each student a ten-speed bike would be cheaper than running school buses all seem equally dim. As in the authors' first book of social science projects, a number of the suggested investigations -- on sex roles, language and mass transportation, for example -- might be worth following up. But once youngsters have chosen an area of study they'll need more help than is given here -- and asking them how many of these ideas they consider to be plain silly might be the most interesting project of all.