A system for evalution of motor function, balance, some sensation qualities and join function in hemiplegic patients is described in detail. The system applies a cumulative numerical score. A series of hemiplegic patients has been followed from within one week post-stroke and troughout one year. When initially nearly flaccid hemiparalysis prevails, the motor recovery, if any occurs, follows a definable course. The findings in this study substantiate the validity of ontogenetic principles as applicable to the assessment of motor behaviour in hemiplegic patients, and focus the importance of early therapeutic measures agains coniratures.