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It proved by the data findings that 25 students in practicing and advanced thinker, 15 student in the challenge thinker, beginning
thinker, and accomplished thinker, and 5 student in the unreflective thinker. Overbaugh and Schultz argued that the critical thinking also
means assembling, design, develop, formulate, and construct.
10
Such as judging and evaluating, creating an idea or opinion involves synthesizing
information, judging the information that has been collected and forming an opinion based on that evidence.
Hence, the criteria of Overbaugh and Schultz be the one focus in analyze the students’ writing because their argument or their ideas in
their writing assessed by the rubric which also have those criteria. The last finding is the students’ achievement in argumentative
class. Based on the data, this subject is training the students to have good argument in writing their essay. It means most of the students should
have good critical thinking in writing their essay. The academic achievement also influences their development of
critical thinking whether it becomes better or stays in their first skill. It is in line with D. Brookfield that challenges the use of standardized
assessments of critical thinking adult learning influenced by the differences of student’s critical thinking in learning.
11
Stephen also stated that learning to think critically is an irreducibly social process. It
happens best when people enlist the help of other people to see our ideas
10
Overbaugh, R.C., Schultz, L. 2013. Bloom’s Taxonomy.
11
J. Willey, Sons, Inc. 2002.Assessing Adult Learning.Printed in the United States of America.
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and actions in new ways.
12
Their process in learning determines their critical thinking level.
In the table and diagram of data finding, the students also have good level in build their cognitive skill. It proves there is 47 student in
accomplished thinker, 44 student in advanced thinker, 4 student in beginning thinker, 3 student in practicing thinker, 2 student in the
unreflective thinker, and 0 student in the challenge thinker. For instance, critical thinking is an educational idea.
13
It needs to be taught and learn by the students.
In the end of the discussion above, based on the three cases, the students’ critical thinking level in argumentative class is in the fifth level
or advanced thinker and fourth level or practicing thinker. It proved by those findings that the highest score in the students’ ability in writing
argumentative essay is practicing and advanced thinker, the highest score in the students’ argumentative essay is also practicing and advanced
thinker, and the last the highest score of the students’ achievement in argumentative class is advanced and accomplished thinker. Hence, the
critical thinking level in argumentative class is practicing and advanced thinker level.
Thus, from the students critical thinking level can be concluded that the critical thinking level can develop well if the students really
12
Norris, Stephen P., Phillips, and Linda M, “Explanations of reading comprehension:schema theory and critical Thinking theory”.Teachers College Record. v89 n2Win 1987, 281-306.
13
S.P. Norris, 1985. Synthesis of Research on Critical Thinking.Published by Association for Supervvision and curriculum development.
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apply their ability in thinking. Though, the learning process which focuses in developing the students’ critical thinking is helpful. But, it also
needs help from the teachers, parents, environment and another source which can engage their critical thinking. It can be from learning
autodidact or with educational school.
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CHAPTER V CONCLUSION AND SUGGESTION
This chapter presents the summary of conclusions and suggestion dealing with the research finding of the research. The conclusions come from the findings that
have been discussed in the chapter before. Based on these conclusions, there are some suggestions that are expectation that aims to contribute the critical thinking learning.
A. Conclusion
Based on the findings of the whole research problems which have been presented above, here is the conclusion of the study:
Most of the students in the argumentative class have good ability, skill in writing their argumentative essay and achievement. It proves that
most of them in fourth level or practicing thinker and fifth level or advanced thinker. It can be seen by the data findings that in argumentative
class the higher percentages of the students ability in critical thinking are 29 in advanced thinker and practicing thinker, and the higher
percentages of the students’ writing argumentative essay are 25 students in practicing and advanced thinker, and the higher percentages of the
students’ achievement is 47 student in accomplished thinker, 44 student in advanced thinker. It means their critical thinking ability and
skill is integrated well. They really apply their skill and ability in this class as the facilitator for improving their critical thinking skill. The
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studentsreally apply their cognitive skill when the teachers asks them to write their ideas in their writing of argumentative essay.
B. Suggestion
This suggestion is necessary for the relevant people, they are: 1. For the students
The researcher suggests the student to always apply critical thinking as well as possible in their daily life. Solve the problems with the wise
thinking in order to make the students’ life useful for around them. 2. For lecturer
The teacher needs to care of the students which have lowest critical thinking skill because they have right to have better skill in order to make
their life be meaningful. 3. For the next researcher
The researcher hopes for the next researchers investigates the students which have lowest critical thinking in their daily life. The next
researcher might be better if they describe bravely about the students’ way in building their critical thinking in their daily life. It will be useful because it
will make their life to be meaningful than before if they know the way their thinking solve the problems.
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