In the TOGAF Standard, a well-defined architecture principle must meet several quality criteria, such as understandability, robustness, completeness, and consistency. The criterion most closely associated with a principle being definitive, precise, and reliable under complex decision-making conditions is Robustness. TOGAF describes robustness as the characteristic that ensures the principle provides clear guidance even when applied across a variety of scenarios, stakeholder viewpoints, and architectural complexities. A robust principle remains valid and usable regardless of changes in context or external pressures.

Where other criteria focus on different aspects—such as Stability (long-term applicability), Completeness (covering all necessary aspects of the principle’s intent), and Consistency (avoiding conflict with other principles)—it is Robustness that specifically ensures a principle is sufficiently strong and precise to support consistent decisions in complex environments. This means a robust principle minimizes ambiguity, avoids subjective interpretation, and provides architects with a dependable rule that can be repeatedly applied across multiple architecture domains and transformation projects. By being robust, a principle becomes a dependable instrument for governance and architectural alignment at the enterprise level.