Having academic honesty is a valuable character for tertiary level learners in their learning journey. The purpose of the current study was to study tertiary students’ behaviors of academic honesty regarding school assignments. Data from 8 public universities in Hong Kong were collected through a questionnaire. This questionnaire contained ten scales for evaluating the five components of “the theory of Planned Behavior: 1) attitude toward behavior, 2) subjective norm, 3) perceived behavioral control, 4) intention and 5) behavior”. Rasch analysis had been used for examining psychometric properties of the modified study instrument and generate students’ measures. These students’ measures were then subjected to a path analysis for investigating relationships among 5 components. Results of the path analysis revealed good model-data fits on the two constructs: avoiding academic misconducts and upholding academic truth. Regardless of the predictive power of subjective norms is debatable, attitudes toward behavior and perceived behavioral controls are significantly related to the intentions and behaviors of tertiary students in maintaining academic honesty. The significance of this current study suggests that the implications of results contribute to further research. These contributions to researchers and practitioners include the advancement of current research and teaching techniques, all of which are presented in this thesis. All rights reserved.