The purpose of this study was to determine the effectiveness of 6-week constraint-induced movement therapy (CIMT) on motor function and quality of movement in persons with chronic stroke. Furthermore, the relationship between motor function and quality of movement was analyzed. 15 Persons with chronic stroke (time since stroke > 6 months) received 6-weeks of CIMT. Before and after the CIMT program the following tests were performed: Action Research Arm Test (ARAT), Motricity Index (MI), Dutch version of Motor Activity Log amount of use score (MAL-AOU) and quality of movement score (MAL-QOM), Nine-hole peg test (NHPT), and the Erasmus Modified Nottingham Sensory Assessment (EmNSA). Persons with a chronic stroke improved significantly on the ARAT (p=0.05), MI (p=0.02), MAL-AOU (p=0.01), MAL-QOM (p<0.001), NHPT (p=0.02) but not on the EmNSA (p=0.27). After CIMT, the quality of movement (MAL-QOM) was strongly correlated with the amount of use score (MAL-AOU, r=0.94) and the NHPT (r=0.81). Low correlations were found with ARAT (r=0.26), MI (r=0.05) and EmNSA (r=0.29). It can be concluded that a 6-week CIMT program is effective in improving motor function and quality of movement in persons with chronic stroke while sensory function did not improve. quality of movement is strongly related to the speed of task completion but not to strength or dexterity.