The Theory of Constraints is a management approach developed by Eliyahu Goldratt that focuses improvement on what most limits a system’s performance. It asks which constraint matters to the stated goal and how the rest of the system should support resolving it.

Focus on the limiting factor

The traditional five focusing steps are to identify the constraint, make better use of it, align other work to support it, expand its capacity when needed, and reassess when the constraint changes. This keeps local activity from being mistaken for system improvement. The Theory of Constraints Institute explains the five steps.

For a hypothetical service business, generating more sales may worsen missed delivery commitments if skilled delivery capacity is already the constraint. Adding capacity without addressing unreliable demand may solve a different problem from the one actually limiting results. Diagnose the cause before choosing the project.

iBD uses the idea to choose a quarterly priority

The Roadmap makes installed and missing capabilities visible. Your goals and financial picture establish why a particular gap matters. Together they inform the One Thing; the lowest score does not automatically identify the constraint.

Use the 90-Day Game Plan to state the priority, what will be true at day 90 and the three outcomes that demonstrate progress. A constraint may require more than one quarter or depend on work elsewhere. One module is not automatically the constraint simply because it comes next in the curriculum.

Focus does not cancel ongoing responsibilities

The company still needs to serve customers, meet obligations and manage its functions. The Game Plan focuses improvement effort alongside that continuing work. It does not suspend revenue, margin or financial management for ninety days.

At the Quarterly Boardroom, review the evidence and determine whether to continue, complete or change the priority. Three completed outcomes do not automatically install a milestone; its own completion requirements still apply. Repeated quarters do not guarantee a specific Velocity Score or financial result.

Put the idea to work

Explore Module 3 to connect this idea to the work, evidence and tools. Browse all concepts or see the complete system.