In this study the researcher examined the impacts of dialogical storybook reading on children s receptive vocabulary development and their parents self- efficacy for storybook reading. The study also investigated parents concerns about the dialogical storybook reading technique and the technique s effects on parent-child relationships. Quantitative data were gathered to investigate the impact of the technique on children s receptive vocabulary development and their parents self-efficacy for storybook reading. Qualitative data were collected to examine parents concerns about the technique and its impacts on the parent-child relationship. Results revealed that the receptive vocabulary of experimental group children significantly increased from pre- to posttest. However, this increase did not occur for children in the control group. A comparison of posttest results for the two groups revealed that the experimental groups receptive vocabulary levels were significantly higher than those for the control group.