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C. Research Instrument
The  researcher  is  the  first  main  instrument  in  this  research.  Denzin  and Lincoln 2000 describe  qualitative work as  endlessly creative and the interpretative
and  underscore  that  these  interpretations  are  constructed.  Peshkin  2000  describes interpretation as a blend of imagination and logic of the researcher. Another factor is
how  the  researcher’s  sensibilities  are  inextricably  bound  within  the  interplay  of subject and object.
The second instrument in this research are three English LKS namely Formatif which  stands  for  Formula  Siswa  Aktif.  The  three  English  LKS  are  published  by  the
same  publisher.  The  difference  is  that  they  are  made  for  different  grade.  The  first English  LKS  is  used  by  X  graders.  The  second  English  LKS  is  used  by  XI  graders.
The third English LKS is used by XII graders.
D. Data Gathering Technique
This  research  uses  document  as  the  source  of  the  data.  Since  the  documents which  are  gathered  by  the  researcher  are  already  in  form  of  written  texts,  the
researcher  does  not  have  to  convert  the  data  anymore.  The  three  English  LKS  have several  similarities  and  also  several  differences.  They  are  published  by  the  same
publisher  and  also  made  by  the  same  team.  One  of  the  differences  is  that  they  are made for different grade such as grade X, grade XI, and grade XII.
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E. Data Analysis Technique
This  research  uses  qualitative  content  analysis  as  methodology.  Hsieh  and Shannon 2005 p. 1278 describe a qualitative content analysis as a research method
for the subjective interpretation of the content of the text data through the systematic classification process  of  coding and identifying themes  or patterns.   Mayring  2000,
p.2  delivers  quite  similar  point  as  she  describes  content  analysis  is  an  approach  of empirical,  methodological  controlled  analysis  of  texts  within  their  context  of
communication, following content analytic rules and step by step model, without rash quantification.
The  data  which  were  gathered  by  the  researcher  later  were  analyzed  using three requirements according to categorization and criteria of good LKS by Darmodjo
and Kaligis. They mention three requirements which should be considered in making good  quality  of  LKS.  Three  requirements  are  didactic  requirement,  construction
requirement,  and  technical  requirement.  Each  requirement  consists  of  different number of categorizations. The researcher uses those categorizations in analyzing the
quality of each English LKS to discover how good the fulfillment of each LKS is. In  order  to  simplify  the  study,  the  researcher  makes  three  different  tables.
Each  table  represents  each  requirement  and  the  criteria  which  are  the  part  of  the requirement.  The  three  tables  represent  the  didactic  requirement,  construction
requirement, and technical requirement.
29 The  researcher  uses  a  table  which  consists  of  six  criteria  of  didactic
requirement. The LKS formatif is analyzed per chapter. Each LKS formatif is analyzed using  those  six  criteria  per  chapter.  The  research  is  conducted  by  analyzing  each
chapter of each LKS formatif  in order to get a very detail information. All the criteria in the didactic requirement which are used in analyzing the English LKS are presented
as the follows.
Table 3.1 Didactic requirement
Evaluation aspect Criteria fulfillment
Yes No
1. Inviting students to be more active in the
process of learning 2.
Having various activities and stimuli through several media
3. Developing students social communication skill
4. Developing students emotion
5. Developing students’ morality
6. Developing students’ aesthetics
The  second  table  represents  the  construction  requirement.  The  construction requirement consists of eight criteria. Each chapter of each English  LKS is analyzed
using all the eight criteria as well.