The new UK-IS Journal Club held its first meeting on 27th April. Hosted by UK-IS Chair Deborah Ghate, the group reviewed Lessons from complex interventions to improve health by Penelope Hawes (2015) Annual Review of Public Health 36:307-23. The group who attended – a mix of researchers, practitioners and post-graduate students – had a lively and enjoyable discussion, and this blog contains a summary of the take home messages from the meeting. ABSTRACT Complexity—resulting