COBOL- and PL/I-applications are still performing their tasks reliably. However, the longer these applications live, the more debris and technical debts accumulate in the applications, making their maintenance and further development increasingly difficult and error-prone. It also makes sense to clean up applications in the run-up to modernisation projects in order to prevent errors and minimise costs.
Traditionally, the clean-up of (legacy) software is done manually. During this process, the variety of possible clean-ups is performed program by program. But very often, not all possible and necessary clean-up actions are known from the outset. Some of them only come in sight when other clean-up measures have been implemented. A much better and safer strategy is to perform one clean-up task for all programs in one go at the same time, before - using the knowledge acquired - performing the next clean-up task. This requires an approach where each program might be changed more than once. The risk and effort of such an approach can be eliminated by using an automated solution that repeatedly can be applied consistently for as many clean-ups as needed.
The zExpert Forum is the z/OS working group of GSE Switzerland: The forum of “z/OS Experts for z/OS Experts” in Switzerland meets twice a year to discuss experiences and provide interesting presentations.
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