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< previous page page_62 next page > Page 62 and/or drawn upon by those in organisations involved in decision making. On analysis, SD is found to assume that social reality is best considered simple and unitary. The type of model developed in SD dictates this. Although there may be many elements and relationships, the model structures developed are normally deterministic and do not evolve over time (the parameters are time-invariant), and the model is largely closed to the environment (all influential factors are contained within, the main inputs being in the form of perturbations to the model). Analysis is, therefore, along a closed sequence of causes and effects, a closed path of action and information. The model also implies some underlying taken-for-granted purpose, the unitary position expressed in terms of the transformation being performed by the system (the model). We will now look at SD in more detail, considering sequentially its philosophy, principles, model and methodology.
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