A brief summary of pilot and feasibility studies: Exploring terminology, aims, and methods

•All pilot studies are feasibility studies but not all feasibility studies are pilot studies.•Aims & objectives should always focus on feasibility concerns and include, but not exclusively focus on, outcome measure analysis.•Mixed methods, including questionnaires, focus groups, and interviews, should be used to collect feasibility data.•In addition to analysing study operational data e.g. recruitment rates, attrition rates.