Even when the respondent wants to cooperate, not all questionnaire responses are sufficient in telling the tester the right information. One of the problems is that questions cannot be fully specified. For example, even when the question is simple "Do you make friends easily?" But it is hard to say what is meant by "easily". What does "friend" mean - intimate companionship? Pleasant interaction without emotional involvement? Or is it something in between? If the person regards himself as the type who makes friends easily - he marks YES. Another equally popular respondent applying a
different standard marks NO. This will also affect the accuracy of personality testing.
Response Sets
Response sets can limit the answers to several often ambiguous choices. This can prove to be a problem. Similar people may have different results because they may set the boundary between different answers such as "like" and "indifferent". Also, people often have a bias toward saying "like", "yes", "often" or "indifferent"
and this can be a problem in personality measurement. Furthermore, because of the limitation
in answers, the test may be ineffective in diffrentiating different personality types.
