Platform delivery models compared

Which model offers the most control?

A custom build can offer the most design control, but only when the buyer can sustain technical and operational ownership. A license transfers some implementation responsibility while introducing product and contract constraints. A modular model divides control across interfaces and therefore depends on strong integration governance.

Criterion	Custom build	Licensed platform	Modular integration
Product control	Potentially high	Bounded by vendor product	High at owned layers, shared at interfaces
Initial definition burden	High	Medium	High at boundaries
Operational ownership	Buyer or contracted team	Shared with vendor	Distributed across suppliers
Switching work	Depends on architecture and data portability	Depends heavily on contract and export support	Depends on interface isolation
Best evidence	Architecture, delivery controls, operating plan	Product fit, SLA, roadmap, export and exit terms	Interface contracts, observability, failure and replacement plan

When is a custom build not a fit?

A custom build is not a fit when the organization wants control but cannot assign people to product ownership, technical governance, operations, and maintenance. Ownership without operating capacity becomes dependence on the development supplier under a different label.

When is a licensed platform not a fit?

A licensed platform is not a fit when a required differentiator conflicts with the product’s roadmap or extension model. Before selecting it, test the exact workflows, data access, configuration, integration limits, and exit provisions that matter to the planned business.

When is a modular approach not a fit?

A modular approach is not a fit when the organization cannot manage multiple suppliers, contracts, incidents, and data flows. Modularity reduces some forms of lock-in but can increase coordination work and make accountability unclear unless boundaries are explicit.

What should the final decision record contain?

The decision record should name the selected model, rejected alternatives, decisive evidence, uncertain assumptions, operating owner, review trigger, and exit path. Use the build-versus-buy guide to prepare the evidence, or send GEN a project brief for a consent-based routing review.