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Once the framework has been set to justify the need for simplification, CEISAR proposes a method to simplify legacy systems:

• Describe the old System
  Old Enterprise System, Block Cartography and Technical Architecture.
• Describe the new System
  New Enterprise System, new Block Cartography and Technical Architecture.
  Explain how they relate to the simplification objectives.
• Decide which Blocks to keep/transform/replace
  Based on Block interdependence, refine the scope to take into account propagation. 
  Based on Block decomposition and Block evaluation (with respect to complexity and old/new Enterprise System gap analysis), choose between keeping, transforming or replacing each Block.
• Define simplification Governance
  For strategic Governance, set-up a small governing body with business people, have metrics and dashboards, train IT people, enforce Architecture committees and empower Domain managers
  For project Governance, keep the subject on the steering committees agenda, choose simplification ordering logically if possible (input Blocks first), but favor progressive phasing with landing points and intermediary business benefits.