Methods	Sampling frame: from RCT investigating behavioural graded activity. Data collection: indepth interviews. Data analysis: grounded theory approach.
Stated aim of study	To investigate which factors explain the difference, after a behavioural graded activity programme, between people who successfully integrate activities in their daily lives and those who do not succeed in integrating activities in their daily lives.
Details of participants	Country: Netherlands. Sample number: 12. Age: ≥ 55 years. Gender: 4 male, 8 female SES: not stated. Ethnicity: not stated. Occupation/employment: Not stated
Details of exercise programme	Provider(s): physiotherapists. Training: yes. Setting: primary care. Content: behavioural graded activity delivered individually according to strict protocols directed at increasing the level of activities in a time‐contingent way, with the goal being to integrate these activities into daily living; included written materials such as education messages, activity diaries, and performance charts. Length/intensity: maximum of 18 sessions delivered over a 12‐week period, followed by 5 preset booster sessions in week 18.
Notes
Quality appraisal
Questions used to judge the dependability and credibility of studies		Review authors' judgements
Were steps taken to increase rigour in sampling?		Yes, a (fairly) thorough attempt was made.
Were steps taken to increase rigour in data collection?		Yes, several steps were taken.
Were steps taken to increase rigour in data analysis?		Yes, a fairly thorough attempt was made.
Were the findings of the study grounded/supported by data?		Fairly well grounded/supported.
What was the breadth and depth of findings?		Good/fair depth but limited breadth.
To what extent does the study privilege the perspectives and experiences of older people with osteoarthritis of the knee or hip?		Somewhat.
Overall dependability and credibility of findings		Review authors' judgements
Dependability of findings		Medium.
Credibility of findings		High.