The compatibility analysis of subject matter description with basic competence at science textbook for 7 th grade of junior high school

The aim of this research is to analyze the quality of science textbooks for 7 th grade of Junior High School in Bandung City. This research use content analysis method and data analysis with quantitative descriptive analysis technique. The compatibility analysis of subject matter description with basic competence use instrument which adopted from the instrument of BSNP and based on three indicators, (1) completeness, (2) broadness, and (3) deepness. Completeness based on the presentation of subject matter, broadness based on the presentation of concept, definition, procedure, or example which support to the subject matter, and deepness based on subject matter explanation. The samples are one electronic textbook (BSE), be code in A and two non-electronic textbooks (non-BSE), be code in B and C. The samples selected by purposive sampling technique. Analysis result shows that the completeness of book A, B, and C are 100%, 96,15%, and 96,15% consecutively. The broadness of book A, B, and C are 100%, 88,46%, and 84,62% consecutively. The deepness of book A, B, and C are 92,31%, 88,46%, and 73,08% consecutively. So, book A (BSE) have better quality than book B and C (non-BSE).


Introduction
The textbook is the important element and most often used by teachers and students for instruction and learning in science lesson.Weiss, Nelson, Boyd and Hudson [1] reported that 90% of all science teachers use textbooks for classroom instruction.Based on the research result, [2] explained that pattern of use of textbooks at school was quite different to that at university, with expectations regarding the use of textbooks being more structured and consistent at school.The textbook at school has some function according to [3], these are development tool of matters and programs in education curriculum, facilitate academic work of the teacher, facilitate achievement of objectives learning, and facilitate the efficiency and effectiveness of learning activities.[4] explained that textbook should be helpful to understand the main scientific concepts easily.Main scientific concepts should be presented deeply in the textbook, but the presentation should not bring on misconceptions.Woodward, Elliott, and Nagel [in 5] explained that teachers rely on textbook programs to supply not only subject matter content, but also teaching strategies and tactics in the form of elaborately worked out approaches to the presentation of the major school subjects and detailed lesson plan.BouJaoude [in 6] explained that teaching, assessment, and the quality of textbooks used are also important factors that need to be considered if students' experience with science is to be complete and fulfilling.The central position of the textbook in instructional and learning needs serious attention by teacher.Davis [in 7] asserts, for successful teaching, it is essential that preservice and also inservice teachers are encouraged to look critically at curriculum materials and science textbooks.Based on the same reasons as explained above, Indonesian government by [8] ensures the quality of textbook by four feasibility criteria; these are content, language, presentation, and graphic feasibility.The quality criteria of Indonesian textbook and International textbook such as in United States of America (USA), England, or Turkey is same basically.The difference lies in the concern at specific issue such as gender and the most important is the involvement of many people with diverse expert in the textbook preparation.One of the most important of textbook criteria is content feasibility which can be assessed by the compatibility of the subject matter description with basic competence.This reason agrees with [7] that the intentional selection of "traditional science textbooks" was made on two bases: First, in the context of novel curriculum implementations.Basic competence based on [9] is some competences which student has in the certain subject matter as the reference for arranging competence indicator.The compatibility of subject matter description with basic competence in science textbook can guarantee that all students in Indonesia can get the same standard of subject matter, so that the quality of education can be spread evenly.The compatibility of subject matter description with basic competence based on [3] has three indicators, (a) completeness, (b) broadness and (c) deepness.Completeness based on the presentation of subject matter, [3] explained that the indicator of subject matter completeness is the matter which presented in the textbook at least load all of the subject matter that supports reach of Competence Standard (SK) and Basic Competence (KD) which have been formulated in subject curriculum concerned.Broadness indicator based on explanation [3] is the presentation of the concept, definition, principle, procedure, examples, and training found in the textbook by the need of subject matter that supports reach of Competence Standard (SK) and Basic Competence (KD).Deepness based on [3] is the description of the matter should be by the cognitive, affective, and psychomotor aspect that requested by SK and KD.The level of difficulty and complexity of the subject matter tailored to the student level of cognitive development.
Although the textbooks are attainments of teacher or lecture which is believed to have qualified in the field but did not rule contained, little or lot, things that do not meet the standards, as described by [10] in National Agency of Education Standards (BSNP) bulletin that there are many textbooks that has not been rated and needs assessment in order to meet the standards set in accordance with Government Regulation (PP) number 19 year 2005 and Ministry Regulation number 22 and 23 year 2006.The same explanation by [3] that there are textbooks that are not by the demands of the curriculum, contains only points of the matter (a kind of summary), and highly technical description.The same report based on TIMSS research (in Schmidt et al., 1997) given by [11], that textbooks in the United States cover many more topics, in less depth, than those in other, higher achieving countries.[1] Report too that the Chinese ordinary high school biology textbook does not include a sufficient number and variety of phenomena relevant to the set of key ideas.Central concepts in the textbook are not covered in enough depth to give students a chance to truly understand them.[4] Report that the content distribution is not systematized and is fractured into piece also said that the relationships among the concepts are weak and also there is no content integrity.[12] asserts, that the highly competitive textbook market has caused publishers to include as many topics as they can, and this has resulted in the thickest textbooks found in the world.In specific research result, [13] explained that only nine of the educators (56%) were of the opinion that sufficient content knowledge regarding the topic of heat was presented in their textbooks.The other seven educators (44%) wanted more content and more explanations of interesting phenomena.The opposite result given by [14], based on their research result about published textbook analysis in Pakistan, the compatibility content of General Science textbook and demand of curriculum get maximum score at all textbooks.Based on this problem and central position of science textbook in instructional and learning activities, need to be an analysis about the quality of existing science textbooks.

Research Methodology
This research use content analysis method.According to [15] that research conducted on the information documented in recording images, sounds, text, or other forms of recording, commonly known as analysis research documents or content analysis.The samples are three science textbooks for 7 th grade and selected by purposive sampling technique.One book is electronic textbook (BSE), be code in book A. The other two are non-electronic textbook (non-BSE) and be code in book B and book C. The BSE is compulsory textbook that has been assessed and determined by government and non-BSE is textbook that has not been assessed and determined by government but circulates in the market and commonly used by students and teachers.The process of collecting the data source of BSE done in 5 Junior High Scholl which representing five rayon in Bandung City, these are East Bandung, West Bandung, South Bandung, North Bandung and Southeast Bandung, while non-BSE selected from textbooks that are widely circulated in the market and popular use by students.
The compatibility analysis of subject matter description with basic competence use the instrument which adopted from BSNP instrument and based on three indicators, (1) completeness, (2) broadness, and (3) deepness.The basic competence that used in this research based on Curriculum 2006 with total 26 basic competences (KD).The subject matter that presented in the textbook is judged compatible with basic competence if the subject matter has met all of the completeness, broadness, and deepness indicators.Data analysis use quantitative descriptive analysis technique and the textbook analyzed by each chapter.For next, to know number of subject matter that compact with KD, be calculated with percentage technique, as follows:

%=
Number of KD that presented with meet criteria Total number of KD x 100%

Completeness
There are two KD of book B and one KD of book C that the subject matter is not complete.The result summarized as follows:

Broadness
There are three KD of book B and four KD of book C that its subject matter not meets the criteria of broadness.The result summarized as follows: Book B at KD 1.2 presented kind of thermometer too expand which include the bimetal thermometer, barrier thermometer, thermocouple, gas thermometer, pyrometer, and infrared thermometer.Explanation of bimetal thermometer, barrier thermometer, thermocouple, gas thermometer, and pyrometer be judged too early for Junior High School students.

Deepness
There are two KD of book A, three KD of book B, and seven KD of book C that presented not meet the criteria of deepness.The result summarized as follows: The subject matter presented at Book A related to KD 1.3 is not detail, the procedure to read measurement result of caliper and micrometer screw is not clearly.There are not clear instruction how to read the main scale and the nonius scale value, such as if measurement value of the main scale there are between two numbers, which one should be used.A technical procedure like this did not explain by book A.    4.4).At this subject matter, the presentation about chemical reaction is too deep which include decomposition, decomposition due to heating, decomposition due to the flow of electricity, decomposition due to light, oxidation, reduction, neutralization, precipitation, exchange reaction, and fermentation.Book C did not present practice content about natural phenomena observation of biotic and abiotic so that the deepness of that content cannot be assessed, whereas the presentation of this practice content demand of KD 5.1.The last, book C presented the diversity of living things material (KD 7.2) which include subject matter about monera, algae, fungi, euglena, moss, plants, classification of dicotyledonae, and characteristic of vertebrate animals is too deep and detailed because these subject matter not only mentioned but also described in detail.

Conclusion and Discussion
Based on analysis result, all of the books have not met all of the criteria.Data that get from analysis and calculated with percent technique obtained that the completeness of book A, B, and C are 100%, 96,15%, and 96,15% consecutively.The broadness of book A, B, and C are 100%, 88,46%, and 84,62% consecutively.The deepness of book A, B, and C are 92,31%, 88,46%, and 73,08% consecutively.Based on these result and combine all criteria, so compatibility of subject matter with basic competences of book A, B, and C are 92,31 %, 84,61%, and 73,08% consecutively.All textbook have diverse quality.This result shows that still there is room for improving the textbook quality.
Based on the possibility of improving the textbook quality, there are things that we must think again, because the compatibility subject matter description with basic competence based on completeness, broadness and deepness criteria is basic feasibility criteria of science textbook but it turn out there are science textbook have not met these criteria, and on this research there are no textbooks which can meet all criteria.There some possibility that becomes the reason why this happened.Science textbook which contain by physics, biology, and chemistry subject matter must written by the expert in education and its science field.Book A write by two authors, book B by five authors, and book C by three authors.Book A and B did not explain the detail profile of their authors, but book C explained it and there is no author which specialty in chemistry field and there are possibility that the other books did not write by the author which field in Physics , biology, chemistry, and education expert all at once.International textbook such as Glencoe Science always involve many expert in various science field and education field.Perhaps, the another possibility is several authors not reviewing curriculum in detailed so that demand of basic competence not presented at the textbook or the author not refer to feasibility criteria which already arranged and published by BSNP.The analysis result of this research can take into consideration that all science textbook before disseminated in the school and the market must be assessed by the government to assure that all science textbook have standard feasibility.This idea support by the result of this research that book A which have assessed by BSNP have better quality regarding completeness, broadness, and deepness criteria than book B and C.
Book B and C did not present the subject matter about separation of the mixture based on chemical properties while book A presented that matter such as addition coagulation at processing of fresh water by water district corporation.Book B and C just presented the matter about separation of the mixture based on Physics properties such as filtering, distillation, decantation, etc. whereas KD 4.2 require the matter about separation of the mixture based on Physics and chemical properties.

Figure 1 .
Figure 1.Mixture separation based on chemical properties at book A

Figure 2 . and 3 .
Figure 2. and 3. Explanation of Bimetal thermometer (left) and Barrier thermometer (right) at book BThe subject matter of Physics and Chemical Properties (KD 4.1) at book B is too brief (just 1,5 page).The subject matter of Mixture Separation based on chemical properties (KD 4.2) at book B and C did not met criteria of broadness because that subject matter not presented complete, so every subject matter not presented completely will not meet criteria of broadness or deepness because there is not subject matter presented.At KD 4.3 and KD 5.1, the subject matter presented at book C did not support with practice content about Physics al change and observation of biotic and abiotic natural phenomena whereas KD 4.3 and KD 5.1 require these contents.These practice contents demand of in their KD text, there are conclude Physics al and chemical change based on simple experiment result (KD 4.3) and do the patterned and systematic observation to get information about biotic and abiotic natural phenomena (KD 5.1).At another subject matter, book C presented that subject matter of diversity of living things is too expand which include various types monera, algae, fungi, euglena, moss, plants, classification of dicotyledonous, and characteristic of vertebrate and invertebrate animals.

Figure 4 .Figure 5 .
Figure 4. Subject matter about moss at book C

Figure 6 .
Figure 6.Subject matter of Measurement with Micrometer Screw at book A Book A explained acid and base properties (KD 2.1) include ionization concept while another book not presented.The ionization concept more appropriate presented at Senior High School level.At KD 2.3, book C presented material on the nomenclature of the compound is too deep which include the naming of compounds with three constituent elements, moreover the explanation of nomenclature of the compound is not detail like the latin name of index number.Book C explaining the subject matter of Properties of Element (KD 2.4) involving the concept of Groups and Periods in the periodic table element while this material is too deep for Junior High School.Book B presented about Heat (KD 3.4) too deep that involves the concept of Thermal Conductivity, Convection Coefficient, and the Stefan-Boltzmann Equation.This matter is too complicated at the Junior High School level, and not by the demands of the deep of KD 3.4.Presentation of these matters as follows

Figure 9 .
Figure 9. Physics Properties matter that presented at book B At the next KD, book B, and C presented subject matter of Mixture Separation (KD 4.2) have not met deepness criteria because there is no subject matter about mixture separation based on chemical properties.Book C at Physics and Chemical Change material (KD 4.3) actually be judged have met deepness criteria on all subject matter presented, except there is practice content about Physics change so that the deepness of that content cannot be assessed.Presentation of this practice content is important because the demand of KD 4.3 conclude the Physics and chemical change based on simple experiment results.Besides KD 4.3, book C presented another subject matter did not meet deepness criteria too; there is the subject matter of Chemical Reaction (KD4.4).At this subject matter, the presentation about chemical reaction is too deep which include decomposition, decomposition due to heating, decomposition due to the flow of electricity, decomposition due to light, oxidation, reduction, neutralization, precipitation, exchange reaction, and fermentation.Book C did not present practice content about natural phenomena observation of biotic and abiotic so that the deepness of that content cannot be assessed, whereas the presentation of this practice content demand of KD 5.1.The last, book C presented the diversity of living things material (KD 7.2) which include subject matter about monera, algae, fungi, euglena, moss, plants, classification of dicotyledonae, and characteristic of vertebrate animals is too deep and detailed because these subject matter not only mentioned but also described in detail.

Table 1 .
List of KD did not meet the completeness criteria at subject matter presented in textbook

Table 2 .
List of KD did not met the broadness criteria at subject matter presented in

Table 3 .
List of KD did not meet the deepness criteria at subject matter presented in textbook