41 understanding of students who are not accordance with the learning
material. During the students present the result of their discussion, teacher
knows their Creative Thinking Ability from their ideas. The Creative Thinking Ability can know from students’ creativity to solve the problem,
students’ creativity to explain the ideas, and creativity to answer and asking a question, during the discussion and the learning process. The
Creative Thinking Ability in this research can know from the observation result and Creative Thinking Ability test.
E. Data Collection Technique
Data collection techniques used in this research are as follows: 1. Observation
Observation is a method of measuring the data to obtain primary data. It is conducted directly observation and systematically, by using
the senses sensory eyes, ears, nose, hands, and mind Mustafa EQ 2009: 94. Observation is used in this research is to observe the
students Creative Thinking Ability during the learning process using Problem Based Learning Model by observation guidelines.
2. Creative Thinking Ability Test Creative Thinking Ability test used to determine the students’
Creative Thinking Ability during the learning process by using Problem Based Learning Model. There are pre-test and post-test. The
pre-test and post-test are different questions, but the characteristic of
42 question is same, in order to make Creative Thinking Ability students
are more developed. A pre-test is to determine the students ability at the beginning before the action. A post-test is to determine the
students’ ability after the action is given. This Creative Thinking Ability test uses test from Torrance or TTCT The Torrance Creativity
Thinking. 3. Documentation
Documentation is the result of recording students’ learning process in the class. The documentations use in this research are a
Ulangan Harian UH mark in taxation subject to divide a group when discussion and photos when the learning process by using Problem
Based Learning Model to improve the students’ Creative Thinking Ability.
F. Research Instruments
Instruments are tools that use by researcher to facilitate the measurement of variables Mustafa EQ 2009: 93. The instruments used in
this research are as follows: 1. Observation Sheet
Observation sheet used to observe the students’ Creative Thinking Ability during the learning process by using Problem Based Learning
Model. There are guidelines for observation with the indicator of Creative Thinking Ability to make the observation easier. The
