Observations of the quality of interaction between staff and residents were made to assess the impact of training and support provided to care staff in nursing and residential homes. Assessments were made before, during and at the end of the training intervention using an adaptation of the Quality of Interactions Schedule (QUIS) modified to avoid the ceiling effect of the original version. A significant increase in the proportion of time staff spent in positive interactions with residents was observed, both in terms of direct care (p < 0.002) and social contact (p < 0.05) at the end of the training schedule. Levels of resident activity were also found to increase immediately after completion of training (p < 0.001). The results suggest that changes in the quality of interaction between staff and residents can be obtained by providing regular training and support to care workers. These findings suggest that the training schedule used in the present study may have a positive impact on the quality of care provided in nursing and residential homes for the elderly.