27

(Zetriuslita, Wahyudin, & Jarnawi, 2017)

Students have problem in developing critical thinking skills during PBL process in Mathematics class.

28

(Serevina & Sari, 2018)

The implementation of PBL in e-module helps to increase students’ science process skill.

29

(Zwaal & Otting, 2015)

The implementation of PBL can be successful if the tutors and students are given a proper training in terms of management.

30

(Sarı, Alıcı, & Şen, 2017)

The uses of PBL in engineering were to develop students’ thinking skills and increase their interest in the profesion.

31

(Günter & Alpat, 2017)

PBL can be used as teaching method to increase students understanding on the given topic.

32

(Rattanatumma, 2016)

The groups of students learning via STAD model of cooperative learning displayed higher scores in the post-test measuring mathematics learning achievement and problem solving ability.

33

(Caesar et al., 2016)

Students’ engagement can be efficiently enhanced and grasping of geographical content can be improved through PBL activities.

34

(Prayekti, 2016)

PBL is one of a method that increase students motivation and form an active learning among students.

35

(Khumsikiew, Donsamak, & Saeteaw, 2015)

Pharmacy students were satisfied and their competencies were enhanced via the PBL course.

36

(Nurzaman, 2017)

Students characters can be improved through PBL process during the process of solving problems.

37

(Beatrice, Amadalo, & Musasia, 2015)

Encouragement and improvement of linear programming by using this intervention.

38

(Brown, Lawless, Rhoads, Newton, & Lynn, 2016)

Students able to develop their writing skills and actively participate in learning during PBL. This method also create meaningful learning context through the activities.

39

(Podges & Kommers, 2017)

PBL improves their attitude, motivation and reflection significantly.

40

(Raiyn & Tilchin, 2015a)

PBL changes the relationship between learner and teacher and has an impact at the learner level.

41

(Sedaghat et al., 2017)

In PBL, students can developed various skills and it can effect their best achievement in learning.

42

(Çakiroğlu & Öztürk, 2017)

Help-seeking skills, task strategies and goal setting and planning were gradually enhanced during this process.

43

(Wardono, Waluya, Mariani, & Candra, 2016)

Improvement within mathematics literacy ability was seen as PBL models were used with A PMRI approach assisted by E-Learning platform, Edmodo.