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98                                               P.-O. Siebers and F. Klügl

              While the framework represents a structured modelling approach, there will
            always be iterations required by the users to improve definitions from previous
            tasks. When stepping through the framework, the users may realise that they did
            not consider important elements/details in a previous step or that they considered
            too many or that they considered them wrongly. In particular discussions in focus
            groups unearth these kinds of issues and are therefore extremely valuable for the
            model development process. The framework is a suitable tool for well-organised
            discussions and to capture the knowledge and ideas coming out of these discussions
            in a formal way. While there is a given sequence of steps that users should follow,
            they need to be prepared to go back to a previous task if required and apply changes.
            Consequently this means that the users do not have to worry too much if in the
            initial rounds they get things wrong or things feel incomplete. They should simply
            move on to the next task if they feel that they have some form of contribution.
            Our experience is that it is necessary to revisit each task four to five times before
            there is a satisfying result that is acceptable to all stakeholders. In that sense, the
            approach somewhat resembles “agile” approaches of software engineering with
            frequent interactions with stakeholders and frequent iterations and not investing a
            lot of time into specifications that are obsolete after the next discussion.
              While this framework will not work perfectly for all possible cases, it provides
            at least some form of systematic approach. The user should be prepared to adapt
            it to fit individual needs. In the following we will explain each step (including the
            necessary tools) and exemplify its application.
              In order to demonstrate the use of our structured approach, we use an illustrative
            example, which is based on work by Zhang et al. (2011), Susanty (2015) and Bed-
            well et al. (2014). In this example we focus on the simulation model development
            to support studying the impact of normative comparison amongst colleagues with
            regards to energy consumption in an office environment. Normative comparison in
            this context means giving people clear regular personalised insight into their own
            energy consumption (e.g. “you used x% more energy than usual for this month”)
            and allowing them to compare it to that of their neighbours (e.g. “you used x%
            more than your efficient neighbours”). A simulation study could compare the impact
            of “individual apportionment” vs. “group apportionment” of energy consumption
            information on the actual energy consumption within the office environment.



            Gathering Knowledge


            The task of knowledge gathering is one that happens throughout the structured
            modelling approach and in many different ways. The main ones we use in our
            framework are literature review, focus group discussions, observations and surveys.
            The knowledge gathering is either a prerequisite for tasks (e.g. a literature review)
            or embedded within the tasks (e.g. focus group discussions). For our study, all
            focus groups were led by a computer scientist (the initiator of the study), and the
            participants consisted of a mixture of academics and researchers from the fields of
            computer science, business management and psychology. In this example study, we
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