NCT01646333.

Methods	RCT (ongoing) of memory and problem‐solving training vs non‐directive supportive therapy
Participants	Clinical diagnosis of Parkinson's disease (PD) Clinical diagnosis of MCI Exclusion criteria: clinical diagnosis of dementia or other PD‐associated comorbid conditions (e.g. severe anxiety, depression, excessive daytime sleepiness, or psychosis) that can influence cognitive testing.
Interventions	Memory and problem‐solving training consisting of a day calendar manual and note‐taking system and problem‐solving techniques focusing on memory compensation and problem‐solving strategies. Control group: supportive therapy (offering participants and carers the opportunity to discuss and reflect upon both PD and non‐PD related problems).
Outcomes	Primary outcome: verbal learning measured by the California Verbal Learning Test‐II Long Delay Free Recall Scaled Score Secondary outcomes: well‐being measured by the Linear Analog Scale Assessment Overall Well Being scale Outcomes measured at 2 and 6 months.
Notes	Unclear whether this study is cognitive training or cognitive rehabilitation; contact with author has not been possible. Trial appears to be ongoing.