This pilot study was to validate and examine the reliability of the psychological well-being instrument in school organizations (i-OS). This instrument consists of 130 items and was distributed to 60 teachers from two schools in the Federal Territory of Kuala Lumpur. This instrument was developed to measure four constructs namely i) job demands of teachers in schools; ii) sources of teacher employment in schools; iii) teacher's personal resources; and iv) holistic psychological well-being of teachers in schools. The Rasch Model approach was used to check the validity and reliability of the instrument through this pilot study. The Rasch model is used because this approach can measure the reliability of respondents and items and it is even stronger than just looking at Cronbach's Alpha. Winsteps Version 4.8.0.01 software was used to examine the functionality of items from the aspect of reliability and item-respondent isolation; polarity; item fit measures the construct; standardized residual correlation value; scale review; maps of individual abilities and item difficulties; and differences in item functioning (DIF) based on gender. The final analysis found that 27 items were dropped because they did not meet the inspection criteria and 8 items were refined because they partially met the inspection criteria and took into account the expert's recommendations. The final instrument showed a total of 103 items suitable for use after refinement to measure the four constructs of the i-OS instrument. Since this study is only a pilot study, distribution to real respondents can be done to measure all four i-OS constructs.
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