Background and Objectives: Individual differences after trauma vary considerably and can range from posttraumatic stress disorder (PTSD) to posttraumatic growth (PTG). Current theoretical models cannot fully explain this variability. Therefore, we integrated attachment theory with Ehlers and Clark's (2000) model of PTSD to understand whether attachment style is associated with negative appraisals of a traumatic event(s), posttraumatic stress symptoms (PTS) and PTG. Our aim was to test this integrated model PTSD in an analogue sample who had experienced at least one traumatic event. Methods: The sample comprised 393 university staff and students (RangeAge= 18 to 49, 85% female) who completed online measures. Design: We used structural equation modelling to test the association of adult attachment and posttraumatic cognitions (self and world/others) with PTS and PTG using a cross-sectional, correlational design. Results: Attachment anxiety and negative posttraumatic self-cognitions were positively associated. Negative posttraumatic selfcognitions were positively associated with PTS. Attachment anxiety had an indirect effect (via negative posttraumatic self-cognitions) on PTS, whereas attachment avoidance predicted more negative posttraumatic world cognitions and lower perceived PTG. Conclusions: The study highlights the importance of considering how attachment styles influence posttraumatic emotion regulation and cognitive processing of the trauma to determine posttraumatic mental health.Key Words: attachment, emotion regulation, posttraumatic symptoms, perceived PTG, posttraumatic cognitions Running head: ATTACHMENT, POSTTRAUMATIC SYMPTOMS AND GROWTH 2The Associations between Adult Attachment, Posttraumatic Symptoms and Posttraumatic GrowthTraumatic life events present a challenge to the individual who has to assimilate the meaning of the event into pre-existing beliefs about self, other and the world. The majority of people accomplish this assimilation successfully and do not continue to experience post-traumatic symptoms (intrusions, avoidance, and arousal) after the first few weeks or months following a trauma. Indeed some people report positive changes such as finding life more meaningful, valuing relationships more, or discovering spirituality; a phenomenon described as posttraumatic growth (PTG). Of those who do not recover, not all develop full-blown posttraumatic stress disorder (PTSD); some may present with sub-clinical levels of post-trauma symptoms which can be disabling and interfere with daily functioning. Both PTSD and posttraumatic symptoms can persist for long periods after the trauma (Basoglu & Paker, 1994;Yule et al., 2000). Two key maintaining factors in current cognitive models of PTSD (Brewin & Holmes, 2003) that explain this persistence are changes in view of self and others. In this paper, we consider how attachment theory might add to our understanding of these changes and then go on to apply this model to a population of university students and staff who had experienced a trau...