The Commission has published a Communication and a Practical Guide on quantifying harm in actions for damages based on breaches of Article 101 and 102 of the TFEU. The Communication clarifies the background and purpose for providing guidance in quantifying harm in competition damages cases. It describes the challenges of quantifying the harm suffered through an infringement of EU competition rules and explains the interplay of rules and principles of EU law and national law. Furthermore, the Communication introduces the Practical Guide, which aims at offering practical assistance to national courts and parties involved in actions for damages. The Practical Guide provides insights into various forms of harm typically caused by anticompetitive practices, sets out information on the methods and techniques available to quantify such harm and presents and discusses a wide range of practical examples. The Practical Guide is purely informative and does not bind the national courts or parties. Source: Official Journal (OJ 2013 C167/19) 13/6/2013