Background: Data collection tools used in literature to evaluate the degree to which study objectives are fulfilled should be standardto ensure the accuracy of data.Objectives: The present study was performed to standardize and validate a questionnaire designed for investigating the conceptsof a health belief model of the style and pattern of using disposable plastic containers.Methods: A review of literature suggests few questionnaires are available on the style and pattern of using disposable containers.In the first step of the present study, the first draft of the questionnaire was designed and its reliability and concepts were evaluatedusing expert comments. In the second step, its understandability was evaluated in a pilot study on ۳۰ subjects. In the third andfourth steps, the questionnaire reliability was respectively examined using the test-retest and lot quality assurance sampling (LQAS)through calculating a Cronbach’s alpha in STATA.Results: The questionnaire subscales included demographic information (۸ items), perceived sensitivity (۵ items), perceived severity(۷ items), practical guidance (۳ items), perceived benefits (۹ items), perceived barriers (۷ items), perceived self-efficiency (۸ items),perceived pleasure (۶ items) and interpersonal norms (۴ items). The questionnaire was distributed among ۲۰ individuals, and theywere asked to examine its understandability. At least ۸۰% of the items were acceptable as per quality assurance standards. After revisingthe questionnaire as required, it was presented to thirty samples. They were also asked to complete the questionnaire againwithin ۱۵ days, and the results were evaluated for quality assurance. The items were then modified according to the degree to whichthe objectives were realized. Thirty participants ultimately completed the questionnaire, and the results were evaluated for qualityassurance.Conclusions: In a large body of literature, developing standard assessment tools has been considered the main step toward scientificresearch; nevertheless, standardizing a questionnaire in a way that it is made sensitive can be time-consuming. The presentresults confirmed the validity and reliability of the designed questionnaire for evaluating the health belief model of patterns ofusing disposable plastic containers.