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Table 3 Frequency of nomenclature used

From: Exploratory studies to decide whether and how to proceed with full-scale evaluations of public health interventions: a systematic review of guidance

Nomenclature Number of sources
Pilot trial/study 16
Feasibility trial/study 8
Feasibility and piloting stage 5
Pilot and/or feasibility trial/study 5
Phase II trial/study 3
Exploratory trial/study 3
Other terms (external pilot, feasibility studies but not pilot studies, non-randomised pilot studies, randomised feasibility studies, randomised pilot studies, exploratory pilot study, feasibility RCT, formative study, phase II stage, pilot RCT, process evaluation with a pilot trial, randomised feasibility trial, randomised pilot trial) Terms presented once or twice across different sources of guidance.
  1. Note: terms are not mutually exclusive