TS EN 61165

TS EN 61165 is the standard on applying Markov techniques to model and analyse systems whose behaviour depends on their state. It provides general guidance for using these techniques to estimate reliability, availability, maintainability and safety measures, making it especially relevant where systems move between operating, failed, repaired or otherwise defined states.

What a Markov model means in practice

In a Markov representation, a system is described by a finite set of states and the transitions between them are treated probabilistically. The techniques covered by this standard are homogeneous Markov techniques, meaning the state transition rates are assumed to be constant and independent of time. That assumption simplifies analysis and solution methods, but the model remains appropriate only when the real system can reasonably be represented in that way.

Use in reliability, availability and maintenance studies

The standard is not limited to one industry; it is applicable wherever state-dependent systems need to be analysed. In practice, Markov analysis is used to study state probabilities over time, expected operating periods, repair-related return paths and the transition structures that influence availability. It gives engineers a systematic way to examine complex behaviour through states, transitions and rates rather than by treating the system as a single undifferentiated whole.

As a methods standard, TS EN 61165 defines a conceptual framework for applying Markov techniques rather than a product-specific requirement set. It is therefore useful for building models, interpreting results and supporting reliability-centred decisions across different technical domains.