Table 2.

Interview guide for implementers and nonimplementers

Theme	Questions	Constructs
Implementers
Introduction	We are going to talk about GLA:D Back. Do you have some general thoughts you would like to share with us?	Implementation in general
Implementation	Will you tell about your experiences with GLA:D Back?	Experiences
Implementation/motivation	What was the reason that you signed up for the GLA:D Back course? (What were your expectations attending the course?)	Expectations, motivation
Implementation intervention	Can you share your thoughts regarding the course? In which way do you use the knowledge and skills delivered at the GLA:D Back course?	Evaluation of the course Knowledge, skills
Implementation/internal factors	Which factors, at a personal level, have an influence on your capabilities of delivering GLA:DBack Can you tell how you perceived the GLA:D Back course to enable you to deliver GLA:D Back to the patients	Self-efficacy Knowledge, skills
Implementation/external factors	Which other factors at the clinic/patients/your colleagues’ influence make it harder/easier to delivery of GLA:D Back? Please expand on this	Context Organization Patients’ perspectives
Intentions	What are your plans for using GLA:D Back? Are there factors that influence your choice of future use of GLA:D Back? If you look one year ahead, which factors influence the fact that you still use GLA:D Back? Please expand your thoughts on this	Sustainability, continuing implementing Intentions
Attitudes	How is your view in general for the management of patients with nonspecific lumbar problems? Has GLA:D Back changed the way you treat back pain patients? In what way? Do you expect other consequences of using GLA:D Back than those related to patients? Can you describe the effects of GLA:D Back on patients? What do you think patients experience by attending in GLA:D Back?	A biomedical or behavioral approach Internal factors, Beliefs in consequences, Patients – expected perception
Norms	Have others (colleagues, patients, doctors, leads, etc.) opinions about you using GLA:D Back? Does this matter to you?	Social and professional norms from colleagues, patients and acknowledgement
Perceived behavioral control	What knowledge, tools, and capabilities do you need to deliver GLA:D Back? What are your thoughts about the tools presented at the GLA:D Back course? How do you find that you are capable of delivering GLA:D Back?	Knowledge and skills Beliefs about capability
Content course	What experiences (good, bad, others) do you have in: Selection of patients to enter the program Testing the patients Doing the patient education Training patients with the exercises Do the evaluation tests	Practical details of delivering GLA:D Back Innovation
Nonimplementers
Implementation/motivation	What was the reason that you signed up for the GLA:D Back course? (What were your expectations attending the course?) What was the reason that you intended to use GLA:D Back after the course?	Expectations, motivation
Implementation intervention Content course	Can you share your thoughts regarding the course? Did you feel capable to deliver GLA:D Back after the course?	Evaluation of the course Practical details of delivering GLA:D Back
Attitudes	What are your overall thoughts on the GLA:D Back program?	Beliefs about consequences, Patients’ perspectives Beliefs about capability
Implementation/external factors, internal factors, norms	What are the reasons that you did not implement GLA:D Back? Physical framework – Management's attitude – Colleagues’ attitude – Patients’ reaction – Resources	Context Organization Patients’ perspectives
Implementation intervention	What do you think is most effective: the existing program you have for your low back pain patients or GLA:D Back? Why?	Beliefs about consequences, Patients’ perspectives
Perceived behavioral control	Have you used parts of GLA:D Back in your daily practice? If so, which?	Knowledge and skills Beliefs about capability
Intentions	Do you plan to use GLA:D Back at some time? What is that decision depending on?	Intentions