11 Objectives: Psychologically informed practice (PIP) is advocated for physiotherapists to help 12 people with chronic pain. There is little research observing how PIP is delivered in clinical 13 practice. This study describes behaviours and techniques used by experienced physiotherapists 14 working with groups of people with chronic pain. 15 16 Setting and Participants: Experienced physiotherapists (n=4) were observed working with 17 groups of people with chronic pain in out-patient pain management, and physiotherapy 18 departments, in a large UK city centre teaching hospital. 19 20 Design: We observed the clinical behaviours and interpersonal skills of experienced 21 psychologically informed physiotherapists, enriched by their accounts of intentions. The 22 physiotherapists were audio and video recorded delivering group movement sessions. 23 Recordings were reviewed with the physiotherapists for elaboration of intentions, then 24 thematically analysed for comparison with defined CBT competencies. 25 26 Results: Four themes representing physiotherapist intentions when working with people with 27 chronic pain were identified; building a therapeutic alliance, reducing perceived threat, 28 reconceptualising beliefs and somatic experience, and fostering self-efficacy. The 29 physiotherapists also reflected on challenges including engaging patients in self-management, 30 encouraging activity and reinforcing rather than correcting movement. Considerable overlap 31 existed between the observed behaviours in this study and existing CBT competencies. 32 Conclusions: This paper complements current recommendations for delivering psychologically 33 informed physiotherapy by providing examples of these skills being used in clinical practice. 34 Further research supporting the development of training for, and mentoring of, 35 physiotherapists, to promote competence and confidence in delivering psychologically informed 36 interventions is recommended. 37 38 Key words: 39 Chronic pain, Psychologically informed, Cognitive Behavioural Therapy, Qualitative 40 41 Contribution of paper 42  This study describes behaviours and techniques used by experienced physiotherapists 43 working with groups of patients with chronic pain. 44  This paper complements current recommendations for delivering psychologically 45 informed physiotherapy by providing examples of these skills being used in clinical 46 practice. 47 48 49 50 51 Background: 52 53Chronic pain is difficult to treat and poses a major healthcare challenge, affecting up to half the 54 UK population [1]. Its management requires a biopsychosocial model prioritising self-55 management [2], since treatment of even the most severely affected 1% requires more 56 resources than could ever be available [3]. Psychological approaches to extend and enhance the 57 skills of physiotherapists, and promote self management with patients, have been advocated for 58 over twenty years [4]. Delivering these psychological approaches and promoting patient self-59 management necessitates changes in us...