The task force of the Parkinson Study Group Cognitive/Psychiatric Working Group has recommended the Montreal Cognitive Assessment (MoCA) as the most suitable tool to detect mild cognitive impairment (MCI) in patients with Parkinson’s disease (Chou et al. Mov Disord 2010; 25: 2501-2507). The task force further recommended that the MoCA be employed in clinical trials of PD where the primary outcome is not cognitive performance.