RT Journal Article SR Electronic T1 Hospex and Concepts of Simulation JF Journal of the Royal Army Medical Corps JO J R Army Med Corps FD British Medical Journal Publishing Group SP 202 OP 205 DO 10.1136/jramc-154-03-19 VO 154 IS 3 A1 Arora, S A1 Sevdalis, Nick YR 2008 UL http://militaryhealth.bmj.com/content/154/3/202.abstract AB A conceptual three-level framework is presented for understanding the aims, scope and potential outcomes of simulation in healthcare contexts. At the first level, micro-simulation aims at honing basic technical skills of individual clinicians. At the second level, meso-simulation aims to train clinicians to work more effectively and efficiently as part of a clinical team. At the third level, macro-simulation aims to assess organisational fitness for purpose at large scale. We discuss HOSPEX as an exemplar macro-simulation and argue for needs- and evidence-based implementation of simulation-based training at micro, meso and macro levels.