James Taylor's Decision Management

James Taylor

Some thoughts on legacy modernization

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Cross-posted from my blog JTonEDM

I saw this white paper by IBM on Legacy Modernization with business rules and thought I should quickly re-summarize my point of view on this and link to my various posts on the topic. The white paper does a nice, if IBM-centric, job of outlining the key issues:

  • You don't need to modernize the whole application
  • Decision making components are often the highest change, most difficult to maintain pieces of mainframe systems
  • Externalizing these components using a business rules management system dramatically reduces the maintenance costs of a legacy application while both improving its agility and positioning you for replatforming later.

The basic steps:

  • Analyze the code to find the decisions
  • Rework the code to isolate these decisions in their own component
  • Work out the rules for these decisions and document them in a business rules management system
    You can analyze the code to find rules but starting with the original policies/regulations is often much more effective as code analysis gives you VERY technical rules
  • Use the BRMS to redeploy the rules as a decision service that the legacy application can access
  • Retire the replaced code

Read the white paper, even if you are not an IBM customer, as it is a nice summary. For those of you who want my opinion, check out these posts:

James Taylor blogs about decision-management technologies such as predictive analytics and business rules, discussing how they deliver agility, improve business processes and bring intelligent automation to SOA.

James Taylor

James Taylor blogs on decision management for ebizQ, and is an independent consultant on decision management, predictive analytics, business rules, and related topics.

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