The objective is to compare the sensitivity and test-retest reliability of Kinesia HomeView to electronic and hand-written diaries for tracking medication state in the home. Demonstrating comparable or superior results will further support use of the Kinesia HomeView system as an outcome measure in clinical drug trials.

Inclusion Criteria:

• Clinical diagnosis of Parkinson's disease
• On a stable antiparkinsonian medication regimen that includes levodopa for at least 4 weeks
• Experiencing dyskinesia more than 25% of the waking day (score ≥ 2 on Unified Parkinson's Disease Rating Scale item 32)
• With dyskinesias at least moderately disabling (score ≥ 2 on Unified Parkinson's Disease Rating Scale item 33)
• Capable of accurately completing diaries
• Capable of accurately using Kinesia HomeView

Exclusion Criteria:

• Significant medical or psychiatric illness
• Subjects not capable of following the required clinical instructions
• Serious medical conditions that would compromise safety