This study examined the effectiveness of assertiveness training and marital communication skills. The moderating effect of length of marriage and number of children were also investigated. The study adopted pre-test, post-test control quasi-experimental design wish 3 x 2 x 2 factorial matrix. Multistage sampling technique was used to select 84 participants; representing 42 married couples who were selected from the three local Baptist Churches of the three Baptist conferences in Lagos. The comprehensive marital satisfaction scale r = 0.98 was the research instrument used. One (1) hypothesis was tested at 0.05 level of significance using Analysis of covariance (ANCOVA) and Duncan post hoe test. The study revealed that there was a significant main effect of treatment on marital satisfaction (F2, 31 = 19.96, p>0.05) Marital community skills group obtained the highest adjusted post-test mean score on marital satisfaction (X = 396.29), while the least score was obtained by the control group (X = 342.91). Based on these findings therefore, counselling psychologists, marriage counsellors and other professionals working on marriage should make conscious efforts to adopt marital communication skills and assertiveness when managing marital problems and associated challenges. Would be couples should also be expose to the two therapist.