Interview during an interview the requirements

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Interview During an interview , the requirements engineer asks predetermined questions to one or more stakeholders and documents the answers. Questions that arise during the conversation can be discussed immedi-
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26 3 Eliciting Requirements ately, and the requirements engineer may uncover subconscious requirements through clever questions. Interviews can be employed during the entire development phase of the system. An experienced interviewer individually controls the course of the conversation, com- pletely commits herself to each stakeholder, inquires about specific aspects, and thus ensures the completeness of the answers. The most prominent disadvantage of this elicitation technique is that it is very time-consuming. Questionnaire Questionnaire: Making use of open and/or closed questions (e.g., mul- tiple choice questions) is another way of eliciting requirements from stakeholders. If there are a large number of participants that must be surveyed, an online questionnaire is a viable option. Questionnaires can elicit a magnitude of information in a short amount of time and at low costs. As long as answers are predetermined, even stakeholders that are not able to explicitly express their knowledge can deliver an assessment. A disadvantage of using a questionnaire is that it can be only employed to gather requirements the requirements engineer already knows or conjectures. Creating a proper questionnaire is often tricky and time-consuming and requires thorough knowledge of the domain in question and the psychological guidelines for creating ques- tionnaires. In addition, as opposed to interviews, questionnaires do not provide immediate feedback between the surveyor and the surveyed, so it becomes apparent that questions were forgotten or badly formu- lated only once the questionnaires have been evaluated. 3.3.3 Creativity Techniques Establishing innovations Creativity techniques serve the purpose of developing innovative require- ments, delineating an initial vision of the system, and eliciting excitement factors. Creativity techniques are usually not well suited for establishing fine-grained requirements about the system behavior. The following crea- tivity techniques are commonly used [Maiden and Gizikis 2001] : Brainstorming During brainstorming , ideas are collected within a certain time frame, usually in groups of 5 to 10 people. The ideas are documented by a moderator without discussing, judging, or commenting on them at first. Participants use ideas of other participants to develop new origi- nal ideas or to modify existing ideas. After that, the collected ideas are subjected to a thorough analysis. This technique is especially effective when a large number of people of different stakeholder groups are
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3.3 Elicitation Techniques 27 involved. Among the advantages of this technique is that a large number of ideas can be collected in a short amount of time and multi- ple people can expand on these ideas collaboratively. The unbiased col- lection of these ideas allows new solutions to pop up. Brainstorming is
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