Boundary Definition Process
A systematic seven-step process for determining where to draw module boundaries - which functions, components, or domains to bundle together and which to separate.
A systematic seven-step process for determining where to draw module boundaries - which functions, components, or domains to bundle together and which to separate.
When to Use Boundary Definition Process
After deciding to modularize, when defining the structure of a new modular organization, or when redesigning existing module boundaries that are not working effectively.
How to Apply
Map Current Interactions
Document who works with whom, how frequently, what data/decisions are shared. Use Design Structure Matrices (DSM) or Organizational Network Analysis (ONA) to visualize interaction patterns.
Identify High-Interaction Clusters
Look for groups with dense internal interactions and sparse external interactions - these are natural module candidates.
Draft Initial Boundaries
Based on clusters, expertise domains, and architectural dependencies, propose initial module structure.
Test Against Principles
Evaluate proposed boundaries: Do they maximize cohesion while minimizing coupling? Align with capabilities? Anticipate change patterns? Follow architectural dependencies? Enable recombination?
Validate with Stakeholders
Review proposed boundaries with affected groups. Do boundaries make operational sense? What problems do stakeholders foresee?
Refine Iteratively
Use feedback to refine boundaries, then test again. First draft will be wrong - iteration is essential.
Specify Interfaces
Once boundaries are reasonably stable, define how modules will interact using interface specifications.