English: intervention research
Welsh: ymchwil ymyrryd
Subject: Cyllid ac ystadegau
English definition: Intervention research includes studies in which researchers arrange (or follow) a systematic change in conditions to determine the effects on a physical capacity, skill, or performance. Clinical and experimental research are the most common types of intervention research but other systematic efforts to measure the effects of an intervention, including intervention-based case studies and qualitative studies, may be included.
Welsh definition: Ymchwil sy’n golygu ymyrryd a newid amodau gwrthrych yr ymchwil i weld effaith yr ymyrraeth neu’r newid arno - yn gyffredin ym maes iechyd h.y. yr ymyrraeth yn y cyswllt hwnnw yw triniaeth, therapi neu gyffuriau.