Some things are easy to measure, but fairness can be difficult to gauge. Without a standard metric, reconciling people’s different ideals can be problematic—especially in the workplace. One employee’s fairness may be another’s perceived injustice, so establishing objectively fair procedures can be challenging.
One of Thailand’s leading sugar manufacturers, Thai Roong Ruang Sugar (TRR) Group, assessed its employee performance review process to address concerns about inconsistent department head standards for employee evaluation. Using Minitab Statistical Software to examine reviews in each department across its three sugar factories, the company’s human resources manager investigated the significant differences between evaluation scores and designed a new appraisal form to eliminate differing standards of fairness. Data analysis closed the gap between the department leaders’ inconsistent standards or possible bias toward their employees and the new, standardized criteria that established guidelines for fair compensation.
The data from each department were displayed on probability plots to determine distribution fit. Because the data in the probability plots for each department approximately aligned with the fitted normal line, they met the criteria for hypothesis testing. The hypothesis tests highlighted the differences in each department’s scores across the three companies and enabled Suriyakrai to verify the validity of his suspicions about the evaluations. Minitab’s hypothesis test output included graphs as well as a p-value that indicated a statistically significant difference between evaluations at the three factories.
Armed with the results of his analysis, Suriyakrai was able to make a strong case to management regarding the need to improve their evaluation methods, and the clarity of Minitab’s output helped him make a convincing argument. “Management didn’t understand what I was doing, so communicating the results effectively was critical to the project’s success,” says Suriyakrai. “The p-values were excellent evidence in our debates.”
Thai Roong Ruang Sugar Group
- Leading sugar manufacturer and exporter in Thailand
- Founded in 1946
- Continually engaged in research, modification, and improvement of machinery and equipment for sugar production
- Seven subsidiary companies in related industries, including sugar refining, molasses processing, ethanol energy and manufacturing
Standardize employee evaluations in order to minimize bias among department managers and eliminate the potential for unfair treatment.
Minitab® Statistical Software
- Standardized criteria for employee evaluations in all departments across TRR Group’s three sugar factories
- Established guidelines for fair compensation
- Helped plan for each employee’s personal development with reliable evaluations