This type of research is usually undertaken by academics, those studying for higher degrees and professional researchers working in the government and independent sectors.
Fel arfer, mae’r math hwn o ymchwil yn cael ei gynnal gan academyddion, y rhai sy’n astudio ar gyfer graddau uwch ac ymchwilwyr proffesiynol sy’n gweithio ym maes llywodraeth a’r sectorau annibynnol.