47 The calculation was done for each aspects and overall textbook. After the
calculation was done, the result of it would be categorized based on Table 3.9 as follows.
Table 3.9 Categorization of the Criteria Fulfilment
Percentage Category
80-100 Good
60-79 Fair
50-59 Sufficient
Below 50 Poor
The quality of a textbook would be categorized as good if the overall percentage of fulfilled criteria was between 80-100. The quality was fair if the percentage
was between 60-79. The quality would be considered as sufficient if the percentage was between 50-59, meanwhile it is considered poor quality if the
percentage was below 50. Since this was collaborative research, the results of this research were validated by the other collaborators. The other collaborators
had responsibility to read and validate the results of this research.
E. Research Procedure
In conducting this research, the researcher did some procedural research steps. They are preparing the study, analysing the content of the textbook and
writing down the report. The steps were elaborated as follows
1. Preparing the study
The researcher did some informal interviews toward some English teachers in state-owned and private senior high schools in Yogyakarta. These
interviews were done to give the researcher a framework of the using of English
48 textbooks in schools. Based on the result of the interviews, the researcher decided
to evaluate the content of English for Senior High School Students XI for Science and Social Study Programme.
2. Analysing the content of the textbook
The researcher tried to study underlying theories of a textbook evaluation. After that, the researcher gathered textbook evaluation criteria according to the
experts. The researcher tried to find the most applicable checklist to be used in this research. Finally, it was decided to adapt and use a checklist adapted from
Cunningsworth’s textbook evaluation checklist. Then, the textbook was analysed based on the criteria on the checklist.
3. Validating the results
The next step was validating the results of the research. In order to avoid subjectivity in analysing the content of the textbook, the researcher tried to find
theories to help decide whether each criterion in the checklist was fulfilled or not. After all criteria had been analysed to be fulfilled or not fulfilled, the two other
researchers crosschecked the analysis. The researcher discussed the criteria fulfillment with the other researchers. Finally, the other researchers agreed with
the analysis. Therefore, if this research was conducted by the other two researchers, the results would be same.
4. Writing down the report
The last step of this research was writing down the report. The report of this reserach covered the rationale for this research, the theories, the procedure of
