“…Ambulatory monitoring techniques such as the Experience Sampling Method (ESM) or Ecological Momentary Assessment (EMA) have been increasingly applied over the last decade to study of a range of psychiatric disorders, including mood disorders (Myin-Germeys et al, 2003;Peeters et al, 2006), psychosis (Delespaul et al, 2002;deVries and Delespaul, 1989;Granholm et al, 2007;Kimhy et al, 2006;Myin-Germeys et al, 2001, personality disorders (Ebner-Priember et al, 2006;Farmer et al, 2004;Loewenstein et al, 1987;Stein, 1996), eating disorders (Hilbert and Tuschen-Caffi er, 2007;Smyth et al, 2007;Stein and Corte, 2003), social anxiety (Brown et al, 2007;Kashdan and Steger, 2006;Lee et al, 2006) and substance use (Cooney et al, 2007;Freedman et al, 2006;Hopper et al, 2006;Krahn et al, 2005;Lukasiewicz et al, 2005;Swendsen et al, 2000). A principal advantage of this approach is that it allows researchers to assess symptom expression in a manner that is often inaccessible to standard hospital or laboratory protocols, and to model complex within-person processes over time.…”