Fault Tree Analysis(FTA); which is used to give a graphical representation of the reliability of a system in order to predict the performance of its elements and identify any key poor performers that need further designing.And maintains the overall life cycle cost of keeping a system available.

Pros:
1. Allows a clear representation of the process.
2. Pin points any failings within the system that could cause complete failure without additional barriers in place.
3.Very important in industries where a failure will have catastrophic results.
4.Its main advantage is in the use of simple equations of probability for drawing the comparison.

Cons:
1. FTA is of limited value on non-critical systems and systems with multiple states of failure.
2. Not effective where the repair rates vary with the transient nature of failure.