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Business Rules - Design and Modeling Guidelines

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A primer on influence of business rules on application architecture, a brief guideline on rules modeling and design.

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Business Rules - Design and Modeling Guidelines

  1. 1. Rule Design Guidelines and Best Practices 1 Keshav Deshpande Software Developer kdeshpande1@verizon.net
  2. 2. • Application Architecture with Business Rules • Separating Business Procedures from Business Rules 2 • Structure of a Business Rule • Anatomy of Rule Execution • Business Rule Modeling, Best Practices and Guidelines • Business Rules vs Validation Checks Topics
  3. 3. Application Architecture with Business 3 Rules
  4. 4. Application Architecture with Business 4 Rules
  5. 5. Application Architecture with Business 5 Rules • Business procedure/workflow distinct from Business Rules • Business Rules hosted and executed within rules engine Implications  Separation of concerns • generally accepted as good application design pattern  Business rules can be independently modified • Modifications done outside of application code  Business Analysts can access/simulate/run/test Business Rules • in isolation from application
  6. 6. Business Procedure Vs Business Rules 6 Example Business Procedure: An incoming claim is routed to appropriate claim processor team, based on claim amount Example Business Rule: claim amount is greater than $10000 route claim to Team A Vs.
  7. 7. Structure of a Business Rule claim amount is greater than $10000 7 route claim to Team A A rule  is a Declarative Expression comprising of – and  can have multiple (and-ed/or-ed together) multiple (and-ed together) Rules can be grouped together – expressed as or Assertion Action
  8. 8. Anatomy of Rule Execution A Rules Engine is a • ‘Fact-Assertion-Action’ engine (forward-chaining inference) • Container for rule execution 8
  9. 9. Anatomy of Rule Execution A Rules Engine is a • ‘Fact-Assertion-Action’ engine (forward-chaining inference) • Container for rule execution 9
  10. 10. Business Rule Modeling  Mining Business Tier for Business Rules • Harvesting Business Rules – highly analytical, cross-functional team undertaking  Segregate Business Procedures from Business Rules  A Business Rule exists to facilitate Business Operational Decisioning • imperative - frequent modifiability  Business Rules provide control and governance • “way-we-do-business” • influence behavior of business 10
  11. 11. Business Rule Modeling Frequently encountered question: What about validation check “rules”? Examples: • social security number validation • telephone number validation Can I implement validation check routines as “business rules”? You can, but should you? 11
  12. 12. Business Rules Vs Validation Checks Business Rule Validation Check • Strategic, ‘big picture’ connotation • Business decision-oriented • Frequently modified • Modifications – consequence of dynamic operational environment • Influences “way-we-do-business”  Validation checks best NOT modeled as business rules  If you absolutely have to - use the ‘frequency of modification’ as final 12 decision point • Tactical, narrow focus • Data-oriented • Not modified as frequently • Modifications are aspect of data governance • Amount to pass/fail checks, failures equate to errors
  13. 13. Business Rule Modeling Generally, these are NOT good Business Rules candidates: After all, why use a Rules Engine to execute –  Logic that is not likely to ever change, once implemented  Logic that does not have “way-we-do-business” connotations  Database lookups, data validation checks  Data transformations, long-running processes  Logic that has little influence over business operational 13 behavior
  14. 14. 14 Thanks! Please stay in touch at - kdeshpande1@verizon.net

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