The purpose of this study is to develop an instrument to measure the level of social skills of children with disabilites related to bullying behavior. This is a developmental research, where the instruments that was developed is in the form of self-assessed questionnaire. The social skills instrument developed was using four dimensions that strongly related to bullying behavior, namely, emphaty, self-control, assertiveness, and cooperation. The development process were following four stages. First, a literature review was conducted for constructing the operational definition. Items for the instrument were 3 point Likert-type. The instruments then validated by peer evaluation and its reliability measured using internal consistency method. The result of the study is an instrument measuring the bullying-related social skills which ideally used within the extracurricular activities context where all children gather to socialized in a controlled environment.

Arini, F. D., Sunardi, S., & Yamtinah, S. (2019). Social Skills of Students with Disabilities at Elementary Level in Inclusive School Setting. International Journal of Multicultural and Multireligious Understanding, 6(1), 52. https://doi.org/10.18415/ijmmu.v6i1.489

Blake, J. J., Kim, E. S., Lund, E. M., Zhou, Q., Kwok, O. M., & Benz, M. R. (2016). Predictors of Bully Victimization in Students With Disabilities: A Longitudinal Examination Using a National Data Set. Journal of Disability Policy Studies, 26(4), 199–208. https://doi.org/10.1177/1044207314539012

Cheung, P. P. P., Siu, A. M. H., & Brown, T. (2017). Measuring social skills of children and adolescents in a Chinese population: Preliminary evidence on the reliability and validity of the translated Chinese version of the Social Skills Improvement System-Rating Scales (SSIS-RS-C). Research in Developmental Disabilities, 60, 187–197. https://doi.org/10.1016/j.ridd.2016.11.019

Davies, M., Cooper, G., Kettler, R. J., & Elliott, S. N. (2015). Developing Social Skills of Students with Additional Needs Within the Context of the Australian Curriculum. Australasian Journal of Special Education, 39(1), 37–55. https://doi.org/10.1017/jse.2014.9

Davis, M. H. (1983). A Mulitdimensional Approach to Individual Differences in Empathy. Journal of Personality and Social Psychology, 44(1), 113–126. https://doi.org/10.1037/0022-3514.44.1.113

Heller, S., Borsay, F., & Ullrich, J. (2017). Social power and dimensions of self-control: Does power benefit initiatory self-control but impair inhibitory self-control? Cogent Psychology, 4(1), 1–16. https://doi.org/10.1080/23311908.2017.1288351

Jenkins, L. N., Demaray, M. K., & Tennant, J. (2017). Social, emotional, and cognitive factors associated with bullying. School Psychology Review, 46(1), 42–64. https://doi.org/10.17105/SPR46-1.42-64

Leff, S. S., Power, T. J., & Goldstein, A. B. (2004). Outcome Measures to Assess the Effectiveness of Bullying-prevention Programs in the Schools. In Bullying in American Schools: A Social-Ecological Perspective on Prevention and Intervention (pp. 269–294). Lawrence Erlbaum Associates, Publishers.

Little, S. G., Swangler, J., & Akin-Little, A. (2017). Defining Social Skills. Psychopathology Series, 9–17. https://doi.org/10.1007/978-3-319-64592-6_2

Lorr, M., & More, W. W. (2012). Multivariate Behavioral Four Dimensions Of Assertiveness. Multivariate Behavioral Research, April, 37–41.

Lundgren, L. (1994). Cooperative Learning in the Science Classroom. Macmillan/McGraw-Hill School Publishing Company.

Olweus, D. (1993). Bullying at School: What we know and what we can do. In Blackwell Publishing. MPG Books Ltd.

Rabinowitch, T. C., & Meltzoff, A. N. (2017). Synchronized movement experience enhances peer cooperation in preschool children. Journal of Experimental Child Psychology, 160, 21–32. https://doi.org/10.1016/j.jecp.2017.03.001

Rashid, T. (2010). Development of Social Skills among Children at Elementary Level. Bulletin of Education and Research, 32(1), 69–78.

Richmond, V. P., & McCroskey, J. C. (1990). Reliability and Separation of Factors on the Assertiveness-Responsiveness Measure. Psychological Reposrts, 67, 449–450.

Rose, C. A., & Espelage, D. L. (2012). Risk and Protective Factors Associated with the Bullying Involvement of Students with Emotional and Behavioral Disorders. Behavioral Disorders, 37(3), 133–148. https://doi.org/10.1177/019874291203700302

Salend, S. J., & Garrick Duhaney, L. M. (2011). Chapter 1 Historical and philosophical changes in the education of students with exceptionalities. In Advances in Special Education (Vol. 21). Emerald. https://doi.org/10.1108/S0270-4013(2011)0000021004

Stern, J. A., & Cassidy, J. (2018). Empathy from infancy to adolescence: An attachment perspective on the development of individual differences. Developmental Review, 47, 1–22. https://doi.org/10.1016/j.dr.2017.09.002

UNICEF. (2015). Laporan Tahunan Indonesia.