“…First, one-group pre-test/post-test design was used to evaluate the effectiveness of the intervention program. However, the use of this methodological approach is not uncommon in the literature, particularly for preliminary evaluation of positive psychology intervention programs at the initial stage of development (Bonhote et al, 1999;Carson et al, 2010;Lantz, Buchalter, & McBee, 1997;Migliorini, Tonge, & Sinclair, 2011). Future research should adopt RCT for assessing the outcomes of this intervention in order to minimize potential confounding effects.…”