Impairment Assessment – Part 3 Schedule 1 Accident Compensation Act 2001. Whether the 20% whole person impairment (WPI) assessment was correct. Appellant failed to establish on a balance of probabilities, the assessment was incorrect. There was no clear, credible, cogent expert evidence to establish a flaw in the assessment or a failure to take relevant considerations into account. The 20% WPI assessment was correct. Appeal dismissed.