Bonell C, Oakley A, Hargreaves J, Strange V, Rees R, 2006. Assessment of generalisability in trials of health interventions: suggested framework and systematic review. BMJ 333(7563):346-349

Few randomised trials assess the generalisability of their results. Trials should include evaluations of the feasibility, coverage, and acceptability of interventions. Such information is essential to decisions about adopting new interventions.