By Arthur M. Langer (auth.)
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Additional info for Analysis and Design of Information Systems
Once the flows in the data flow diagram are complete, the next step is to define the actual program logic, or what is typically called the process specifications (discussed later in this chapter). Once again there is no shortcut to save your going through the code program by program. There are some third-party software tools on the market that can provide assistance, but these tend to be very programming-language specific. Although the manual method may seem overwhelming, it can be accomplished successfully and will often provide great long-term benefits.
The question for the analyst is how to obtain the equivalent processes and data from the legacy system. Short of considering a complete rewrite, there are two basic approaches: the data approach and the process approach. The Data Approach Conversion of legacy systems for purposes of structured changes requires the modeling of the existing programs to allow for the use of analysis tools. The first step in this endeavor is the modeling of the existing files and their related data structures. Many 3GL applications may not exist in a relational or other database format.
For these cases, special products exist in the market which provide special automated "version control" features. We are not concerned here with these products but rather with the procedures and processes that allow us to incorporate changes without losing the prior analysis documentation. This kind of procedure can be considered consistent with the long division example in which each time the values change, we simply re-apply the formula (methodology) to calculate the new answer. Analysis version control must therefore have the ability to take the modifications made to the software and integrate them with all the existing models as necessary.