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…

Several common sources of error in assessment that depends on the use of judges are identified, and ways to reduce the impact of rating errors are examined. Numerous threats to the validity of scores based on ratings exist. These threats include: (1) the halo effect; (2) stereotyping; (3) perception differences; (4) leniency/stringency error; and…