Once current system procedure analysis is completed, and a model for current systems is available, current systems analysis can be refined further by recording interactions in more detail. This helps to identify the business impact of changes in data structures that occur as a result of implementing new information systems. This additional detail is especially needed if a system is to be replaced in part.
The expected effect of a current system on an entity within a data store can be summarized using two matrices:
If the relevant facts are included in a CA Gen model, use the Matrix Tool.
This analysis identifies relevant entity types, their existence in current data stores, and their maintenance by the existing systems. It may also become apparent that some current data stores contain duplicate data. This detail is used in confirming the analysis model, for investigating current data stores that are already redundant, or that will become so. It is also used in refining the plan for Transition from existing to new systems. This plan may involve evaluating the accuracy and consistency of data in current data stores, based on a comparison of the current system model and the analysis model.
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