Build vs Buy

Systematically compare building custom solutions vs using off-the-shelf products or services.

Context

You are deciding between building custom or buying existing. Establish clear decision criteria and cost models.

Domain Context

Based on make-vs-buy decision frameworks:

• Build: Full control, learning investment, ongoing maintenance cost
• Buy: Faster time-to-market, but less control, vendor lock-in risk
• Hybrid: Use product but customize parts

Instructions

1. List Requirements: Functional and non-functional needs
2. Compare Options: Build custom, Product A, Product B, Open source
3. Cost Model: Development time, licensing, ops, migration, training
4. Risk Assessment: Vendor risk, technical risk, team capacity risk
5. Decide: Option with best total cost of ownership wins

Anti-Patterns

• Build Anything: "We can build it faster!" Result: years and millions later, still building. Guard: Honestly assess dev time vs buying.
• Vendor Lock-In Ignored: Buy product without exit strategy. Result: stuck. Guard: Evaluate switching cost before committing.

Further Reading

• Make vs Buy Decision Frameworks
• Open Source Business Models