Subdomains

DDD strategic design: subdomain taxonomy (core/generic/supporting), bounded context definition, subdomains vs bounded contexts, physical/ownership boundaries, sizing heuristic (start wide), subdomain type evolution (all 6 transitions), growth management; Evans' originating treatment: Continuous Integration within context, false cognates vs duplicate concepts, context sizing trade-offs

Build vs buy vs open-source decision framework; subdomain type as the primary analytical tool (core → build, generic → buy/adopt, supporting → build simple); hidden costs of buying; platform team as internal build-once option; sourcing reversals as subdomain types evolve

strategic distillation: CORE DOMAIN identification, generic subdomains, domain vision statement, highlighted core, cohesive mechanisms, segregated core, abstract core; escalation of distillation techniques