Purpose
This type of diagram is used to explore why a given event happened or why a certain class of events tends to occur. It is not intended to predict behaviour, but may be used to develop a list of factors to bear in mind when considering comparable circumstances in the future. It is also useful for finding out why something went wrong or keeps recurring, e.g. through a causal loop, so that steps can be taken to prevent its recurrence. It can be derived from an influence diagram or developed anew.