b. One method of reducing these effects is to use questionnaire variations that cause these biases to average out across the sample.
1) Many types of questions may be used, e.g., multiple-choice, checklists, fill-in-the blank, essay, or options indicating levels of agreement or disagreement.
2) Questions must be reliably worded so that they measure what was intended to be measured.
3) The questionnaire should be short to increase the response rate.