This digest offers tips on designing questionnaires and on avoiding common design errors. The following useful suggestions are offered: (1) keep the questionnaire brief and concise; (2) get feedback on the initial list of questions developed; (3) locate personal or confidential questions at the end of the questionnaire; (4) put categories in order; (5) consider combining categories; (6) ask responders to rate both positive and negative stimuli; (7) choose appropriate response category language and logic; (8) avoid open-ended questions; (9) avoid the response option "other"; (10) avoid category proliferation; (11) avoid scale point proliferation; (12) avoid responses at the scale mid-point and neutral responses; and (13) avoid asking responders to rank responses. Carefully evaluating every question and its response choices will yield more meaningful information. (Contains four references.) (SLD)