TS EN ISO 24096-2

TS EN ISO 24096-2 is the standard that addresses how requirements in technical product documentation (TPD) are classified on the basis of severity and susceptibility. It is not a standalone full classification scheme; it is intended to be used together with the framework defined in ISO 24096-1. The focus is on evaluating requirements consistently by considering not only how serious a requirement is, but also how it behaves over time and how susceptible it may be to change or misinterpretation.

How severity and susceptibility work together

In general technical terms, severity describes the impact that a deviation from a requirement may have on documentation, product definition, quality, or business outcomes. Susceptibility helps capture whether a requirement is more vulnerable to change, degradation, or misunderstanding. Using both factors together makes it possible to distinguish not only the most critical requirements, but also those that are more fragile or more easily affected. The standard provides guidance on the rationale and methodology for this combined classification approach.

A framework for consistent evaluation

The document gives guidance on the elements needed for a consistent evaluation of severity over time and notes that such evaluation can support a company business model and brand image. It also explains why parameters beyond severity are useful as a basis for classification and introduces susceptibility as an additional viable parameter. In practice, this supports organizing requirements using more than a single measure, so technical impact and behavioural characteristics are considered together.

This standard is aimed at more systematic management of requirements in technical product documentation, engineering drawings, and related definition work. It provides a conceptual basis for organizations that want stronger alignment in how requirements are interpreted across teams, projects, or time periods.