Safety Analysis requires to build a functional tree of the product and to provide information about potential failures for each product function.

There multiple Safety/Hazard analysis standards/approaches available (FHA, SHA, SSA, PSA etc.) - the required standard may be selected in the "View" menu of Safety module:

Safety Module screen contains two parts: the functional tree in the upper part of the screen and the failure data in the lower part of the screen:

Functional tree may have unlimited hierarchy depth. For each function user may enter unlimited number of potential failures. For each failure, user should provide information about relevant phases, end effect on the whole product, end effect classification (severity) and other details (depending on selected standard/approach).

System Safety Assessment or Probabilistic Safety Assessment requires quantitative evaluation of failure probability for each failure condition. Evaluation can be performed using RBD, FTA or Markov chain. User should select at least one safety assessment mean (RBD, FTA, Markov diagram) to each failure condition. RBD calculation result (unreliability), FTA calculation result (probability of tree root occurrence) or Markov chain calculation result (unreliability) will be taken as failure probability. During the SSA (System Safety Assessment), these calculated probabilities will be compared to the Safety/Reliability (S/R) objectives and Design objectives to make sure that the designed system meets the requirements.

The picture below illustrates linkage between Product tree, FMECA, FTA and Safety (FHA) modules - Safety module uses FTA for failure probability calculation, FTA in turn uses Reliability and FMECA for basic events probabilities calculation:

The last part of the analysis is data output. Safety Module provides different reports – SSA, FHA, Functional Breakdown etc.