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A system boundary is a boundary that separates the internal components and processes of a system from external entities. Internal to its boundary, the system has some degree of integrity, meaning the parts are working together, and this integrity gives the system a degree of autonomy.

All assumptions and boundary conditions should be clearly stated in the documentation of the reliability study. Examples include answers to questions, such as

 What are the objectives of the study?

 What level of detail is required?

 What are the environmental conditions for the system?

 How is the system operated?

 Which operational phases are to be included in the study (e.g. start‐up, steady state, maintenance, and disposal)?

 Which external stresses should be considered (e.g. earthquakes, lightning strikes, and sabotage)?