This study aims to develop and measure the content validity and reliability of the Simplified Obsessive Compulsive Disorder Inventory (SOCDI). The SOCDI is designed to measure the level of obsessive and compulsive thoughts and behaviours among Malaysians. This inventory is based on the American Psychiatric Association (APA) Diagnostic Statistical Manual (DSM) of Mental Disorders, V version. The inventory comprises 18 items divided into 6 subscales, each containing 3 items. Sub-scale 1: Washing, Sub-scale 2: Obsessing, Sub-scale 3: Ordering, Sub-scale 4: Checking, Sub-scale 5: Neutralizing and Sub-scale 6: Hoarding. The content validity of SOCDI was evaluated by a panel of 8 experts, including 3 academicians and 5 registered counsellors. A total of 50 respondents aged 18 to 60 years were selected among Malaysians to obtain reliability scores. The study's quantitative findings using the Content Validity Ratio (CVR) indicated that the SOCDI instrument has good content validity, with all 18 items meeting the minimum CVR value (N=8, CVRcritical = 0.693). The reliability scores show a high value of .884. Hence, this study has successfully developed a questionnaire (SOCDI) which has good validity and reliability values for use in the field of guidance and counselling in Malaysia.
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