This study was motivated by several studies which show that social loafing has a negative impact especially for groups, which is a reduction in overall group performance. Reduced group performance can be caused by the group size. Group size can cause social loafing in groups. The aim of the study is to know whether is influence or impact of group size on social loafing student. The study applied time series design experimental method with three times measurements for two weeks. This study consisted of physical and perceptual measurements. A total of 8 participants consist two women and six men were involved in the study. The sample was purposively selected from student with criteria are active student at Universitas Islam Indonesia and aged 18 to 23 years. Instruments used experiment tool for physical measurement and social laziness scale (SLASC) for perceptual measurements at each session. The result of data analysis used the Anova Repeated Measure showed that there were differences in physical measurements (p = 0.027, p <0.05) and there were no differences in perceptual measurements (p = 0.261 (p <0.05) at each session. Based on the findings, there is an influence of group size on social loafing in physical measurements. There was a decrease in the average score for physical measurements in sessions 1 to session 3. The contribution of the effectiveness of the group size effect on social loafing was 51%.
Social loafing, group size, collage students, SLASC