By the end of this session students should be able to: Critically appraise at least one clinical decision rule or tool fully and be able to explain its application and limitations; Identify the role of clinical decision rules in the management of key disorders presenting to the emergency department; Discuss the role of clinical decision rules in ensuring judicious use or preventing misuse of certain outcomes, such as diagnostic test usage (e.g. PERC to decrease use of D-Dimer, or some of the Ottawa rules for decreasing X-rays); Deliver an effective oral presentation; Critique peers’ presentations and presentation style.