Both of four groups answered the questions from Questionnaire A (Q-A) and Questionnaire B (Q-B) according to the Diagram No.
as shown in Table I. The Questionnaire A is designed to ask questions related to System-A and Questionnaire B is designed to ask the questions related to System-B.
The details of these questionnaires are illustrated in Appendix B.
The questions were designed in such a way that each class diagram contained enough information to answer the questions.
Typically, questions involved three or four classes and ask specific questions to the subjects with each design alternatives.