External validity is an important parameter that needs to be considered for decision making in health research, but no widely accepted measurement tool for the assessment of external validity of randomized controlled trials (RCTs) exists. One of the most limiting factors for creating such a tool is probably the substantial heterogeneity and lack…

Background: The National Institutes of Health (NIH) announced a revised, expanded definition of 'clinical trial' in 2014 to improve trial identification and administrative compliance. Some stakeholders voiced concerns that the policy added administrative burden potentially slowing research progress. Methods: This quasi-experimental study examined…

Background: The term "intellectual disability" is increasingly used to refer to people with learning disabilities in British learning disability policy, practice and research. This change is undoubtedly a reflection of the changing international context. The inclusion of the term "intellectual disability" has been particularly…

This document contains seven papers from a study of the role of distance learning approaches in enhancing the contribution of nonformal education to socioeconomic development in Africa. "Introduction" (Richard Siaciwena) presents an overview of the research project and defines key terms related to nonformal education. "Ghana: The…