In order to further increase the credibility of this study, we also paid attention to the resonance and dissonance between the quantitative and qualitative findings (Greene, 2007; (Lincoln & Guba, 1985). Resonance among the complementary sources of data provided us with more explanatory power with respect to interpreting the effects of the SSI program, whereas dissonance compelled us to revisit the data and to further investigate what might have accounted for conflicting views surrounding the enhancement of students’ communication skills.