Stop Guessing & Start Deciding: The Forrester Framework for Buy vs. Build

07/22/2026

4 min read

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This Report Covers:

Why AI lowers the cost of building software but not the cost of governing and maintaining it

The four failure traps organizations fall into when the buy vs. build debate goes unresolved

A five-step Application Capability Stewardship Framework for making smarter, more durable decisions

The question used to be simple: should we buy software or build it ourselves? The answer is almost never purely buy or build. The real question is: what should you build, what should you buy, and how do they work together? This research gives you the framework to find out.

AI changed the math. Building is cheaper than ever. That's exactly why the decision got harder.

Without a clear framework, most organizations end up in what Forrester calls the irrational decision loop, bouncing between buy, build, and generate without real ownership, accountability, or a plan for long-term value. The real result? Fragile apps, wasted engineering capacity, and the false belief that AI-generated code is a shortcut when it's actually a commitment.

"Use The Application Capability Stewardship Framework To Decide When To Buy, Build, Or Generate Apps," by Joe Cicman and Ken Parmelee, Forrester Research, Inc., July 2026 gives you the framework to break that cycle.

What you'll get:

Forrester's five-move Application Capability Stewardship Framework, including how to anchor decisions in lifecycle stage, separate core systems from edge capabilities, and apply hard gates based on whether a capability is truly differentiating.
A Balanced Scorecard approach for governing capabilities over time so you can make evidence-based decisions about when to scale, pivot, or retire them.
An honest organizational fitness test — including whether your team has the skills, governance structure, and clear ownership to support what you're building.

Information in Forrester publications is based on Forrester’s efforts to compile and analyze the best resources reasonably available to Forrester at any given time. Opinions reflect judgment at the time and are subject to change. This report is part of a broader collection of Forrester resources, including interactive models, frameworks, tools, data, and access to analyst guidance.

FAQs

Why is the buy vs. build decision getting harder, not easier?

AI has significantly reduced the cost of creating software, which makes building seem more attractive than it used to be. But the harder work — governing, maintaining, and running what you build — hasn't gotten any cheaper. Forrester's research shows that most organizations underestimate these ongoing costs and end up in an endless debate cycle without clear ownership or a long-term value plan.
What is Forrester's Application Capability Stewardship Framework?

It's a five-step decision framework built to help organizations stop reacting to the latest tool and start making disciplined, durable capability decisions. The framework covers lifecycle anchoring, capability classification, hard-gate testing, organizational fitness assessment, and a Balanced Scorecard for ongoing governance.
Does AI change the buy vs. build equation?

Yes — but not the way most people assume. AI lowers the barrier to building. It doesn't close the gap in domain expertise, reduce ongoing engineering debt, or guarantee that what you generate today will hold up at production scale tomorrow. Forrester notes that large software vendors are using the same AI tools, so the playing field doesn't automatically tilt toward building just because AI lowers the entry cost.
When does it make sense to build rather than buy?

Build when the capability is core IP or a true competitive differentiator — something that genuinely creates a moat that a vendor solution can't replicate. Buy when the problem is already well-solved in the market and the capability isn't your competitive edge. And consider a blended approach — buying the infrastructure layer and building differentiation on top of it — for capabilities that fall somewhere in between.
What are the most common mistakes organizations make in the buy vs. build decision?

Forrester identifies four predictable failure traps: building fragile apps optimized for speed rather than durability, rebuilding commodity capabilities that vendors already do well, overestimating the competitive edge gained from AI-generated code, and mistaking AI generation for a shortcut when it actually creates significant ongoing engineering and maintenance obligations.