Emphasizing differences in activation as well as valence, six studies across a range of situations examined relations between types of job-related core affect and 13 self-reported work behaviours. A theory-based measure of affect was developed, and its four-quadrant structure was found to be supported across studies. Also consistent with hypotheses, highactivation pleasant affect was more strongly correlated with positive behaviours than were low-activation pleasant feelings, and those associations tended to be greatest for discretionary behaviours in contrast to routine task proficiency. Additionally as predicted, unpleasant jobrelated affects that had low rather than high activation were more strongly linked to the negative work behaviours examined. Theory and practice would benefit from greater differentiation between affects and between behaviours.