Part 2: Identifying the challenges of establishing IPS in the context of PAD In chapter 4 the literature on IPS in the context of PAD is systematically reviewed and discussed. We found 50 relevant articles and identified three main themes, in the discussion important knowledge gaps are discussed and suggestions for further research are given. Chapter 5 consists of a qualitative study for which we interviewed 11 psychiatrists with experience in assessing IPS in the context of PAD. Part 3: Establishing criteria of IPS to guide practice In chapter 6 we use a two round Delphi approach to form 13 consensus-criteria for IPS in the context of PAD with 53 experienced psychiatrists from the Netherlands and Belgium. INTRODUCTION | 23 1