Cognitive impairment is common among non-demented individuals with Parkinson disease (PD) and is a significant source of disability and reduced quality of life. Unfortunately, there are no successful interventions to address these impairments. Prospective memory impairment is a particularly functionally- and clinically-relevant problem in PD. The investigator's project will determine if a targeted intervention strategy improves PD participants' prospective memory. The investigator will use a randomized controlled design and a laboratory-based assessment of prospective memory to test the effect of the strategy in a controlled environment. The investigator will also see if PD participants, with support from an occupational therapist (OT), can generalize the strategy to their complex, real-world environments and tasks. Our goal is to improve PD patients' everyday prospective memory so they can successfully perform desired activities and roles.