Work motivation has profound benefits ranging from increased development to performance for employees and companies. The present nationwide survey adopted the Multidimensional Work Motivation Questionnaire (Gagné et al., 2015) and developed a Work Motivation Scale to accurately measure the construct amongst three groups of respondents working in the Training and Adult Education Sector in Singapore. Using the Rasch-Andrich rating scale model and structural equation modeling (SEM), we investigated the psychometric features of the dimensions of the instrument and its measurement invariance, respectively. We found evidence supporting the fit of the dimensions to the Rasch model and also a good level of partial structural invariance for the majority of the parameters in the SEM model. The present study extends existing self-determination theory literature by measuring work motivation in the multicultural context of Singapore and emphasises the importance of invariance measurement. The findings lend support for the continued use of the Work Motivation Scale to measure the antecedents and outcomes of work motivation.

工作动机具有深远的好处，从提高发展到提高员工和公司的绩效。当前的全国性调查采用了多维工作动机调查表（Gagné等人，2015），并制定了工作动机量表，以准确衡量新加坡培训和成人教育部门三组受访者的结构。使用Rasch-Andrich评级量表模型和结构方程模型（SEM），我们分别研究了仪器尺寸及其测量不变性的心理特征。我们发现了证据支持尺寸适合Rasch模型，并且对于SEM模型中的大多数参数也具有良好的部分结构不变性。本研究通过测量新加坡多元文化背景下的工作动机来扩展现有的自决理论文献，并强调不变性测量的重要性。研究结果为继续使用工作动机量表来衡量工作动机的前因和结果提供了支持。