Boundary diagram

A boundary diagram is used to depict the system boundaries and thus define the system. It presents the interfaces and the intrinsic subsystems and components of a system. It makes major contributions to preparing and planning Design FMEAs.

Boundary diagrams depict the system and its interfaces with adjacent systems, the environment, and/or the system user. A boundary diagram “cuts” the analysis object free. The interfaces are shown in a categorized form. The most common interface categories are:
P – Physically touching
E – Energy transfer
I – Information transfer
M – Material exchange
Human-machine interface

Physical clearance (joint pattern) In the same way, the boundary diagram depicts the inherent relationships for the object of analysis.

The FMEA Handbook from AIAG/VDA states: “Consider the interfaces between subsystems and components in addition to the content of the sub-systems and components themselves.”

Glossary Technical terms at a glance