Abstract: The study aimed to determine the validity and effectiveness of the developed modules in the subject Social Orientation(Soc. Or.) or Personality Development and Public Relations (PDPR). This study was conducted at the University of Rizal System-Morong Campus during the First Semester of School Year 2009-2010 with 15 PDPR professors and 30 second year students of Bachelor of Technology major in Hotel and Restaurant Management as the respondent-evaluators in the study. Descriptive-experimental method of research using the questionnaire-checklist and test results in gathering data was used in the conduct of the study. The PDPR professors validated the modules based on the following criteria: objectives, subject matter, organization and presentation, language and style and usefulness of the module. Pretest-post test design was used to determine the performance of the control and experimental group in which the students were equated and divided into two groups. Mean, standard deviation and rank distribution were used as statistical tools in treating the data. T-test was utilized to test the significant difference between the mean performance of the control and experimental group as revealed by the post test results. It was found out that the modules in PDPR were very much valid as an instructional material. This is shown in the high performance of the experimental group as revealed in their pretest and post test results. The modules in PDPR were perceived to be very much effective by students and professors.