Specific skills and affective expressions coded from the problem-solving interactions of 172 newlywed couples were examined in relation to 8-wave, 4-year trajectories of marital satisfaction. Effects varied as a function of whether husbands' versus wives' topics were under discussion and whether husbands' versus wives' satisfaction was predicted, but results indicate that skills, affect, and their statistical interaction account for unique variance in rates of change in marital satisfaction. The interaction between positive affect and negative skills was particularly robust, indicating that (a) low levels of positive affect and high levels of negative skills foreshadowed particularly rapid rates of deterioration and that (b) high levels of positive affect buffered the effects of high levels of negative skills. Findings suggest specific targets for intervention in programs for developing marriages. Copyright 2005 APA.