The ProF-Cog intervention was carefully designed based on knowledge of risk factors for falls in people with cognitive impairment living in residential care. This intervention was safe but no clinical effect was identified. While it is likely that this intervention did not make any difference to fall risk factors, a lack of effect could be explained by missing primary outcome data collection reducing the sample size to below that required to detect an effect. In addition, limited uptake and adherence to some components of the intervention could explain why risk factors were not modified.