Organizational stability is average effective global activity rate in an evolving E-type system

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• Nirja Shah   -Posted on 06 Oct 15
  - The following are the eight laws laid down by Lehman and Belady.
  
  - The are known as "Lehman's laws of software evolution".
  
  Continuing Change
  - It is an E-type system that must be continually adapted or it becomes progressively less satisfactory.
  
  Increasing Complexity
  - It is as an E-type system evolves, its complexity increases unless work is done to maintain or reduce it.
  
  Self Regulation
  - It is an E-type system evolution processes which are self-regulating with the distribution of product and process measures close to normal.
  
  Conservation of Organizational Stability (invariant work rate)
  - The average effective global activity rate in an evolving E-type system is invariant over the product's lifetime.
  
  Conservation of Familiarity
  - As an E-type system evolves, all associated with it, developers, sales personnel and users, for example, must maintain mastery of its content and behaviour to achieve satisfactory evolution.
  - Excessive growth diminishes that mastery. Hence the average incremental growth remains invariant as the system evolves.
  
  Continuing Growth
  - The functional content of an E-type system must be continually increased to maintain user satisfaction over its lifetime.
  
  Declining Quality
  - The quality of an E-type system will appear to be declining unless it is rigorously maintained and adapted to operational environment changes.
  
  Feedback System
  - It is an E-type evolution process which constitute multi-level, multi-loop, multi-agent feedback systems and must be treated as such to achieve significant improvement over any reasonable base.

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