The document outlines the principles of criminal liability, including the elements of actus reus (the physical element of the crime) and causation. It discusses what can constitute an actus reus such as an act, omission through duty, or state of affairs. For crimes with consequences, the prosecution must prove the defendant's conduct was the factual and legal cause of the result. Intervening acts may break the chain of causation if they are independent and potent enough. The document also provides sample problem questions analyzing issues of causation.