This study presents evidence supporting the psychometric properties of the Voice Climate Survey: an employee opinion survey that measures work practices and outcomes. The tool is tested across 13,729 employees from 1,279 business units representing approximately 1,000 organisations. Exploratory factor analyses, confirmatory factor analyses and internal reliability analyses support 31 lower-order work practices and outcomes that aggregate into seven higherorder work systems broadly covering practices and outcomes such as organisational direction, ethics, resources, involvement, recognition, development, teamwork, wellness, work/life balance, change management, customer satisfaction, job satisfaction, organisational commitment and employees' intention to stay. External validation of the tool is demonstrated by linking scores from the employee survey with independent manager reports of turnover, absenteeism, productivity, health and safety, goal attainment, financial performance, change management, innovation and customer satisfaction.Keywords: Employee opinion survey, individual differences, industrial/organisational psychology, job satisfaction, organisational behaviour, psychological testing and measurement, psychology of work and unemployment, work practices and outcomes Theory and methodology of climate Organisational climate (i.e., employees' evaluation of their work environment including structures, processes and events; Schneider & Snyder, 1975) can be understood as a subset of organisational culture.