Form, Context and Sources of the Data

57 first discussed with the triangulators and the research supervisors. Last, in the final part of the report, the researcher put in her suggestions for the future studies. In analysing the data, the researcher employed a data sheet to categorize the data into their respective categories. The form of the data sheet used in the data analysis is illustrated in a table below. Table 2: A Sample of Data Sheet of Types and Functions of Interruption in High School Musical Movie Series CODE DIALOGUE INTERRUPTION EXPLANATION TYPES FUNCTIONS S IM O VE B UT S IL INTRUSIVE COOPERA TIVE N EU TR A L DI S RE J F L O T O P T AN AG R AS S CL A CO L 1100: 01:25- 00:01:2 6 Mrs. Bolton: Troy, they have a kid’s party downstairs in the Freestyle club. Troy: Kid’s party? Mrs. Bolton: Young adults. Now go, shower up. Troy: Come on. One more. Last one . Mr. Bolton: Real quick, real quick. √ √ At this time, Mrs Bolton tells Troy to get ready for the Teen Party which is about to begin while he and his father, Mr Bolton, are practicing basketball together in the gym. Since Troy still wants to have more practice, he begs his mother to do one last shot. Troys request is obviously supported by Mr Bolton as he elaborates on Troys idea by saying Real quick, real quick that overlaps with Troys last utterance Last one. In this case, Mr Bolton’s interruption belongs to the overlap type because he initiates the interruption at almost the completion of Troy’s utterance in which Troy as the interruptee still can deliver his complete idea. In addition, the function of the interruption is agreement since Mr Bolton as the interrupter does the interruption to show his support for Troy’s idea. Notes: 1100:01:16-00:01:26  Number of the dataNumber of the movie seriesTime of the interruption hour:minutes:seconds 58 Types of Interruption SIM : Simple Interruption OVE : Overlap Interruption BUT : Butting-in Interruption SIL : Silent Interruption Functions of Interruption DIS : Disagreement REJ : Rejection FLO : Floor-Taking TOP : Topic-Change TAN : Tangentialization AGR: Agreement ASS : Assistance CLA : Clarification COL : Collaborative Completion

F. Trustworthiness of the Data

To obtain a trustworthy research, researchers should ensure that their findings and interpretations are valid and reliable. Guba 1981: 80 suggests four criteria which can be used to measure research trustworthiness, namely credibility, transferability, dependability, and confirmability. In this study, two of the criteria, that is, credibility and confirmability, were implemented to promote the trustworthiness of the data. Credibility refers to the accuracy of the findings. The findings are called credible if they accurately describe the subject of investigation. Confirmability, furthermore, is related to the objectivity of the findings. It checks whether the findings are not derived from the researcher’s own perceptions but really based on the information gained from the context in which the data are taken. To fulfil the credibility and confirmability criteria, the researcher carried out triangulation. According to Denzin in Guba, 1981: 85, triangulation involves authenticating the research findings through multiple evidence, i.e. data sources, theories, investigators, and methods. With regard to this research, the data trustworthiness using the triangulation method was attained by cross-checking the data through theories and investigators. To perform the theory triangulation, the