The 9.02 Definition of Causation is a legal term used to determine when a particular action or event is the cause of another. It is used to assess and evaluate the responsibility and liability of someone for a certain outcome or result. There are two main types of causation that are used in legal proceedings: actual cause (also known as "but-for") and proximate cause (also known as "substantial factor"). Actual cause is when the defendant's action is seen as the primary factor in bringing about the injury or loss, while proximate cause is when the defendant's action is seen as contributing to the injury or loss.