The relationship between coefficient of friction (COF) and roughness is best found using tribology approach. This study used experimental design to collect and measure the data on COF and the roughness measurement under contaminated condition. It particularly measured the COF of four different floor surfaces in five surface conditions—one dry condition and four liquid-spillage conditions. For slipperiness measurement, the analysis of variance (ANOVA) was used to determine the effect of floor, footwear, and surface condition on the measured COF. Duncan’s multiple range tests was performed to determine the sample of means that is significantly different from others. Meanwhile, Pearson’s correlation coefficient was used to measure the strength between COF and the roughness parameter
