We searched for Cochrane and non-Cochrane reviews of the effectiveness of interventions to improve arm function after stroke. We included 40 systematic reviews (19 Cochrane reviews and 21 non-Cochrane reviews). The evidence is current to June 2013. The reviews covered 18 different types of interventions, as well as the dose of the intervention and the setting in which the intervention was delivered. These reviews varied in relation to the populations included (initial upper limb impairment and stroke severity) and in relation to the comparison groups included (which were given control interventions, no treatment and conventional therapy). We extracted details of 127 comparisons that had been explored within the reviews. These showed the extent to which different interventions had had an effect on upper limb function, upper limb impairment and ability to perform activities of daily living.