=-3.850, p<.001, d=.62 and self-regulation, t(154)=-3.113, p=.002, d=.50. Finally, results of a path analysis call into question several of the relationships specified by the model. In particular, task meaningfulness only predicted student engagement and was not significantly related to self-regulation or student achievement. The findings of this study suggest the Achievement-Orientation Model may hold promise for the development of interventions to address gifted underachievement; however, future research should be conducted to continue work toward validating the model before this step is taken.iv ACKNOWLEDGEMENTS