7 According to Supriadi 2001: 2, Lembar Kerja Siswa is a book which is
published by private publisher and used by the student based on school’s choice. Based on the newest curriculum in Indonesia which allows the teacher and also the
school to choose their own material, it creates the condition where every school may use different material compared to other schools. It is because the teacher and the
school can choose the best book that they think will give the best contribution to the achievement of the school itself.
Trianto 2008: 148, describes Lembar Kerja Siswa which is known as the LKS as the guidance that students use in order to do the research and to solve the
problem. In workbook, the students may find lot of exercises ready for them to be used in practice. Using all the knowledge they get from the process of learning, they
are hoped to be able to finish the exercises given in LKS.
3. Vocational High School
In the Indonesian educational system regulation number 20 year 2003, paragraph 15 it is said that vocational education is the educational level where the
students are prepared to work in certain field. In Indonesia, Vocational high school is known as Sekolah Menengah Kejuruan SMK. The students of Vocational high
school are prepared to be ready to work in certain field according to their major in school directly after the graduation day.
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CHAPTER II REVIEW OF RELATED LITERARURE
This chapter contains theoretical description and theoretical framework. It consists of theories which are used as the guidance in conducting this research.
A. Theoretical Description
Theoretical description part consists of three parts which are Lembar kerja siswa, evaluating the textbook, and LKS requirements.
1. Lembar Kerja Siswa LKS
A book gives a very big contribution in the process of teaching and learning English language in class. Sheldon as cited in Garinger 2001 says that there are at
least three main reasons why the teachers use book in class. First, developing their own material in class is very difficult for the teacher. Second, the teachers have
limited time to develop new materials. Third, it is because of many external pressures that torture the teachers.
Ansary 2002: 2 says that another reason why the teachers need to use the book is there are many teachers who still lack in experiences feel that book means
safety, guidance, and help. The advantage of using a media, in this case is an English textbook is not only felt by the students but also the teacher. The lessons are
presented in good orders. It helps the teachers to deliver the lessons to the students in a good sequence.
