This is a development research to produce valid and practice Student Worksheet. This research used 3 steps from 4-D models those are defined, design and development. The subject of this research was 28 students class X from SMA Negeri 1 Padang, validated by 2 lecturers and 2 teachers. The object of this research was based student worksheet that validated by 4 validators. The data in this research are primary data consisting of validity and practicality. The result of validity was 87,30% with criteria valid, practicality by teachers was very practiced with value 85,94% and by the student was practicing with value 83,05%.
The teacher is a factor that can directly influence quality improvement in improving the quality of education and students' critical thinking skills. Teachers are responsible for encouraging and guiding students to become proficient in active critical thinking and enjoy learning. The teacher is also responsible for all things in the class and provides assistance such as supporting the stages so that students can develop. A process so that teaching and learning activities in the classroom turn interactive and achieve the objectives of the teaching and learning activities is to use a learning model. An example of a learning model in order to improve students' critical thinking skills is a problem-based learning model. This research methodology is based on seven steps of literature search: determining the purpose of writing, selecting database sources, selecting keywords at the stage of searching a database, carrying out the stages of searching for literature, and determining the inclusion criteria for the articles used. selected according to inclusion characteristics and synthesis results in 20 national and international journals. The purpose of this study was to test the effect of the problem-based learning model (PBL) assisted by worksheets on students' thinking skills. The results of the study found that the problem-based learning model supported by LKPD was effective in increasing students' critical thinking skills.
Curriculum occupies a central position in education. Curriculum changes guided by the times and technology. The main problems of implementation of curriculum change is to change the mindset of teachers. Prospective teachers should have high order thinking skills to face the times and technology. One of efforts could be made a lecturer for conditioning of learning to be able to develop higher order thinking skills of students by using the right assessment. One assessment that play a role in increasing the skills of thinking is portfolio assessment. This study aims to describe the increase in high order thinking skills of students applying portfolio assessment. This research is a classroom action research conducted on students who take courses in curriculum and biology textbook in biology Faculty UNP in the July to December semester of 2017. The results showed an increase in high order thinking skills of students using portfolio assessment.
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