INTRODUCTION
The development of science and technology today changes all aspects of human
life. This condition has a great influence in all fields, one of which is education (Wijaya,
Sudjimat, Nyoto, & Malang, 2016). In the 21st century, the challenge in the field of
education is to improve the quality of Human Resources (HR) so that humans are able to
compete globally (Lestari, 2014). Improving the quality of human resources through
education is focused on higher order thinking skills (HOTS) (Abosalem, 2016). HOTS is
one of the skills needed to prepare graduates who are able to compete and adapt to
changing times. Critical thinking ability is one manifestation of HOTS.
Based on the Regulation of the Minister of National Education Number 22 of
2006, it is stated that the scope of learning in the science and technology subject group is
intended to acquire advanced competence in science and technology as well as cultivate
scientific thinking critically, creatively and independently. Therefore, in learning,
students need to be equipped with critical thinking skills that can be used to analyze and
solve problems they will face in everyday life, one of which is in science learning
(Agustyaningrum, 2015).
The ability to think critically is an important thing, but the reality on the ground
is not as expected (Liberna, 2015). The critical thinking ability of junior high school
students in Indonesia is still relatively low. This is based on the four-year International
Trends in International Mathematics and Science Study (TIMSS) study conducted on
junior high school students with the characteristics of high-cognitive level questions that
can measure students' critical thinking skills, showing that Indonesian students
consistently fall in the lower ranks.
TIMSS is an international assessment of mathematics and science in grades 4 and
8 that has been and is still being held since 1995. In general, TIMSS aims to monitor
educational system outcomes related to student achievement in Mathematics and Science
(Mahmuzah, 2015). Indonesia is one of the countries that became the object of TIMSS in
the last four periods. Talking about scientific achievements, Indonesia's position is still
below the international level, as reported by TIMSS. The results of the 2003 TIMSS
study, Indonesia is ranked 35 out of 46 participating countries with an average score of
411, while the international average score is 467. The results of the 2007 TIMSS study,
Indonesia is ranked 36 out of 49 participating countries with an average score of 397, the
results of the 2011 TIMSS study, Indonesia is ranked 38 out of 42 participating countries
with an average score of 386, while the international average score is 500. The latest
results, namely TIMSS 2015 Indonesia is ranked 44th out of 49 countries (Noordyana,
2016).
Critical thinking is the ability to analyze and evaluate information obtained from
observations, experience, reasoning and communication to decide whether the
information can be trusted so that it can provide rational and correct conclusions. Critical
thinking skills require high-level reasoning, namely high logical thinking. High logical
thinking is needed by students (Savitri, 2013). This is done especially in answering
questions, because students need to use their knowledge, understanding, and skills and
relate them to new situations (Ratnasari & Widjajanti, 2015). Students can think critically
if they are involved in creative thinking on the information obtained (Roets & Maritz,
2017). Students' critical thinking ability can be described with 5 indicators according to