Being a good clinician is not just about knowledge how doctors & other healthcare professionals think reason & make decisions is arguably their most critical skill While medical schools & postgraduate training programmes teach & assess the knowledge & skills required to practice as a doctor few offer comprehensive training in clinical reasoning or decision making This is important because studies suggest that diagnostic error is common & results in significant harm to patients & errors in reasoning account for the majority of diagnostic errors The ABC of Clinical Reasoning covers core elements of the thinking & decision making associated with clinical practice from what clinical reasoning is what it involves & how to teach it Informed by the latest advances in cognitive psychology education & studies of expertise the ABC covers Evidence-based history & examination Use & interpretation of diagnostic tests How doctors think models of clinical reasoning Cognitive & affective biases Metacognition & cognitive de-biasing strategies Patient-centred evidence based medicine Teaching clinical reasoning From an international team of authors the ABC of Clinical Reasoning is essential reading for all students medical professionals & other clinicians involved in diagnosis in order to improve their decision-making skills & provide better patient care