This study aims to investigate the effects of (a) the causalitic-learning Model (CLM) on (a) Problem-solving Abilities (PSA), (b) mastery of physics-concepts on PSA, and (c) the interaction between CLM and mastery physics-concepts on PSA. This research is a quasi- experimental design with an untreated control group design with a pre-test and post-test. The population is all students of class X Public Senior High School (PSHS) 1 Narmada, amounting to 396 people. Samples were taken using cluster random sampling technique and obtained students class X-1 as the experimental class (14 men and 16 women) and X-2 as the control class (9 men and 21 women). The data were collected using a PSA test and analyzed using parametric statistics two-way ANOVA test. With a significance of 0.05 and the criteria if the sig value <0.05 then Ha is accepted, it found that: (a) CLM affects PSA (sig. score = 0.02), (b) mastery physics-concepts affect PSA (sig. score = 0.007), but (c) there is no interaction effect between CLM and mastery physics-concepts on PSA (sig. score = 0.740).