2.5. Designing the Questionnaire The questions of the questionnaire were divided into four distinct parts (1) The effect of the information system, (2) The extent of effect of the support system, (3) the quality of the decision of the managers, and (4) the general information of the managers. Researchers recommend that as much as possible questionnaires of the previous studies be used. Considering this and to contribute to the creation and increase of the questions of this kind of research, a number of questions were prepared from previous questionnaires and specific numbers for this study. All questions were ranked on a numerical scale using five-option Likert. Dean and sharfman(1996) considered five-point scale appropriated and recommended it.
