An in vitro model was developed for laparoscopic pelvic lymphadenectomy. A construct validity study was performed comparing experienced laparoscopic surgeons with inexperienced trainees. Outcome measures included global and task-orientated scoring and data from electromagnetic motion analysis of hands. Marking was performed by three independent surgeons using video playback. A significant difference was found in the time taken, number of movements made and total distance travelled between the groups. Both scoring systems discriminated between the expert and inexperienced group, demonstrating the model's construct validity.