This paper will state the special means of data collections in a questionnaire and an interview in criminal law. A questionnaire is a list of a research questions asked to defendants and designed. An interview is an authorized convening in which sequences of questions are inquired to determine appropriateness and find out data. One of advantages of a questionnaire is that, an open questionnaire gives a researcher a wide range of information to choose from the questionnaire.

Questionnaires also have some disadvantages

One of the disadvantages is that, the information collected is not always tr...