English speaking test
The same performance English speaking test was used as a pre-test and post-test for measuring student’s speaking ability before and after using role play activities. In administering the post-test students were assigned to communicate with their partner in order to improve speaking ability. A researcher and an English teacher who was orientated in the use of instruments for evaluating students’ speaking ability conducted both the pre-test and the post-test by interviewing and random situation for speaking.
Rubric of speaking ability
The evaluation of speaking ability score was adapted from Heaton (1990:68-71) and service institute (FSI.1979) and first certificate in English (FCE.1987) and J.L.D. Clark (Clark. 1975). The components of rubric of speaking ability focused on speaking fluently, confident, accurate pronunciation and smoothly.
Speaking observation form
The speaking observation form was designed to observe students’ behavior toward the use of role play activities in the classroom. It was conducted in accordance with the criteria outline by Ellis (2003). The form consisted of ten performances of five-rating scales. The observation form used in each hour by the researcher.