Missing limits

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A requirement that includes a value without defined boundaries. Without clear limits, the requirement is hard to measure or verify. Use specific ranges to improve clarity and testability.

Table 1. Summary of rule mapping
Category	Description
Rule mapping (INCOSE)	R33 – RANGE OF VALUES
Default Weight	7.5

Example: Add tolerance to a value

Unclear Requirement: The speed of the toy car in water should be 90 km/h.

Issue: The requirement lacks a tolerance range, making it difficult to verify.

Clear Requirement: The speed of the toy car in water should be 90 km/h with ±0.05% tolerance.

When not to use tolerances:

In some cases, such as small, countable discrete items, tolerance ranges are unnecessary. For example:

The car should have five passenger seats, each with a seat belt.