1. Introduction
Science, technology, engineering, and mathematics (STEM) education has been gaining increasing attention in recent decades, as it is often associated with a culture of innovation and excellence [
1,
2]. Future economic growth also relies on the capacity and quality of STEM education delivery [
2]. This situation requires skillful independent thinkers, who can develop their abilities by studying STEM. The mastery of the STEM field is highly relevant to the students’ future education and work careers [
3,
4]. At all levels of education in Indonesia, STEM is taught in the form of integrated science, in which all subjects are taught simultaneously without segregating based on the object of the study (i.e., chemistry, biology, physics, math). In the context of achieving STEM learning performance, Indonesian students still face serious problems. This is evidenced in the results of Trends in International Mathematics and Science Study Indonesia, which was conducted from 1999 to 2015 and showed poor results (
Figure 1) [
5], indicating that urgent intervention is required [
6].
Policies in Indonesia have been set to build an ecosystem that can increase the quality of education and learning performance, relying on the role of teachers as a determinant factor for students’ low achievement. The achievements indicated in the Trends in International Mathematics and Science Study of Indonesia have been associated with students’ reasoning abilities. Poor results correspond to weak reasoning, or vice versa [
7]. An earlier report claimed that only learning required an innovative design to effectively encourage critical thinking competencies [
8], exemplified by the top performances of Singaporeans. Singapore imposes policies by considering critical thinking as a major competency for learning achievement at all education levels, including STEM education. Reasoning is a fundamental concept strongly associated with critical thinking, often identified as reflective or reasonable thinking [
9,
10].
Practicing critical thinking in STEM education and learning is essential. Unfortunately, an effective learning framework or a design to train it has still not been well-established widely [
11]. Nonetheless, critical thinking training can be started for prospective teachers, so in their professional career, they can train their students effectively. However, a recent study showed concern about the poor critical thinking performance of prospective science teachers [
12]. For sustainable development, effective teaching innovations need to be implemented. This is in line with previous studies [
13,
14], in which effective learning models, methods, or strategies need to be implemented if teachers want to make progress in their learning.
The aim of STEM education is to foster critical thinking skills, but the way to develop critical thinking in STEM students requires more investigation [
15]. One of the effective and interactive learning models showing the potential to support the progress of students’ critical thinking is inquiry learning [
16]. This model is considered interesting in science education, and its application is increasingly affiliated with the STEM field [
17]. Therefore, teaching inquiry to prospective STEM teachers is important and beneficial for developing their capacity for STEM understanding [
18].
Inquiry is a learning method that has many forms, but the common idea is that it focuses on student-centered learning activities, where students explore, make knowledge claims, and develop problem-solving skills through the exploration process [
19,
20,
21,
22]. However, another study [
23] highlighted inquiry learning weaknesses, including low student performance in thinking. Teacher guidance is thus crucial for students as they explore or experiment. Moreover, the difficulty of inquiry is often not well understood [
21]. Another study shows that students’ critical thinking habits are not directly proportional to inquiry learning carried out by teachers [
24].
Nonetheless, the criticism of inquiry does not discourage researchers by demonstrating that modification of inquiry method had a positive impact on critical thinking training [
25]. One of the modified forms of inquiry is achieved by integrating it with scientific creativity, further referred to as inquiry-creative learning [
26]. This method allows STEM students to improve their critical thinking skills. Scientific creativity is a feature of STEM education; and fostering student creativity has proven effective to influence thinking ability [
27]. Yet, empirically, the inquiry-creative learning model requires systematic investigation for its effectiveness in training the critical thinking of prospective STEM teachers.
Exploration-based learning approaches such as inquiry and discovery learning are recognized for their strong potential in cultivating students’ critical thinking skills [
28]. This is supported by previous research [
29], which showed the positive impact of discovery learning on the critical thinking abilities of secondary science students. Empirical evidence also needs to be established, in particular on the effectiveness of explorative learning methods like inquiry and inquiry-creative in training critical thinking skills, particularly among prospective STEM teachers. The impacts of inquiry and inquiry-creative are crucial since they determine whether these methods are effective in developing essential critical thinking skills for future STEM educators. Prospective STEM teachers require these skills to facilitate the development and implementation of teaching approaches.
This study evaluates the impact of inquiry and inquiry-creative learning in relation to conventional teaching methods in advancing the critical thinking skills of aspiring STEM teachers. It examines the research question on how well both inquiry and inquiry-creative learning models work in boosting the critical thinking skills of aspiring STEM teachers in the setting of STEM learning in Indonesia.
4. Results
The results of the CTi analysis for the experimental group I (inquiry learning), experimental group-II (inquiry-creative), and control group (traditional learning) are presented in
Table 5. It shows that all groups on the pre-test had a CTi score in the less critical criteria. After different treatments, the post-test results were better than the pre-test. The experimental group II outperformed the experimental I and control groups regarding CTi score. The experimental group I obtained better CTi scores than the control, but both were still in the low category. The average CTi post-test score for the experimental group II (inquiry-creative) was 3.19 with critical criteria, followed by the experimental group I (inquiry) with a CTi score of 1.87 (quite critical), and lastly the control group (traditional teaching) with a score of 1.37 (less critical). The findings shown in
Table 5 confirm that CTi was the highest in experimental II (inquiry-creative) with an n-gain (an increase in score) of 0.70 (moderate criteria), followed by inquiry learning (n-gain = 0.17, low criteria), and traditional teaching (n-gain = 0.09, low criteria).
The average scores of critical thinking are summarized in
Table 6. The average pre-test score of the experimental group I (
N = 28) was 11.39 ± 1.81, falling into the less critical criteria (6.41 < CTs ≤ 12.80), and after intervention of inquiry learning, the scores increased to quite critical (in the post-test) with a CTs score of 14.96 ± 1.62 (quite critical, 12.80 < CTs ≤ 19.20). The highest improvement was found in the experimental group II (
N = 29), in the pre-test to post-test. They increased from 10.41 ± 2.00 (less critical) to 25.55 ± 1.63 (critical). The achievement of CTs was found to be lowest in the control group, in both the pre-test and the post-test, which remained in the less critical category.
Table 6 details the results of CTs in the three study groups. The pre-test results were in the less critical area (criteria), while for the post-test area the performance of CTs was found to be varied. In the post-test, the experimental group II was the highest in terms of the critical area, followed by the experimental group I and the control group in the criteria of moderately critical and less critical, respectively.
The results of the normality and paired
t-test are presented in
Table 7 and
Table 8, respectively. Differences in critical thinking skills for the three groups were tested statistically (preceded by the normality test). The three test groups showed normal distribution (meeting the requirements for parametric statistical tests). The results of the paired
t-test indicated that there were differences in students’ critical thinking skills (pre- vs. post-test) in the three treatment groups (
p < 0.05).
The difference between three groups on the critical thinking skills improvements (post-test parameters) was analyzed by ANOVA (
Table 9). The ANOVA results showed that the students’ critical thinking skills were significantly different in the three sample groups (
p < 0.05).
The LSD test was carried out to determine the location of the differences between the study sample groups (cross difference) (
Table 10). The results of the analysis showed that the critical thinking skills of STEM students were significantly different in all groups (
p < 0.05).
Table 10 reveals significant differences in critical thinking skills among three groups: inquiry learning, inquiry-creative learning, and traditional teaching. The LSD test results showed that the inquiry-creative group outperformed both the inquiry and traditional teaching groups significantly. Specifically, students in the inquiry-creative group showed substantially higher critical thinking skills than those in the inquiry group, with a mean difference of 10.59, and even more so compared to the traditional teaching group, with a mean difference of 14.59. Conversely, the inquiry group also showed superior critical thinking skills compared to the traditional teaching group, with a mean difference of 4.00. These results underscore the effectiveness of the inquiry-creative approach in enhancing critical thinking skills among prospective STEM teachers, significantly more than either inquiry or traditional methods.
5. Discussion
The overall findings indicate that the pre-test scores (CTi) in all treatment groups have less critical criteria. This is due to previous learning experience of all participants not working towards the development of critical thinking. This finding was similar to the one reported by an earlier work [
59] which stated that routine pedagogical practices at the university level do not support improvement in students’ critical thinking performance. Similar results were found elsewhere [
60] from an initial measurement of the critical thinking skills of engineering students, consistent with the finding in
Table 5.
In-depth knowledge in STEM must be supported by the critical thinking of students. In the present research, the opportunity to train and improve critical thinking in STEM students is widely taken by intervening with an inquiry model, found to be the most effective way to train critical thinking. The CTi was proven to be the most effective method in inquiry-creative learning, followed by inquiry learning, with almost no increase in CTi (n-gain 0.09) for the traditional teaching method.
In the inquiry-creative group (Group II), each critical thinking indicator increased. Critical thinking in the aspect of analysis experienced a high increase, while critical thinking in the aspects of inference, evaluation, and decision-making increased in the moderate level criteria. This finding of increased critical thinking in each component was also consistent with earlier report [
32]. It revealed an advantage in the analytical aspects of STEM students when exposed by the pedagogy of the scientific literacy process. Another report [
26] revealed that the pedagogy of scientific creativity in inquiry tends to strengthen the analytical aspects of prospective teachers in addition to aspects of inference, evaluation, and decision making. On the other hand, a descriptive analysis of the CTi parameter showed a moderate increase in the score on inquiry learning, while the n-gains for all CTi variables were under the low criteria. This proves the claims of previous studies [
61,
62] that the evaluation and inference aspects of critical thinking are difficult to train with inquiry learning. However, when inquiry is compared to traditional or conventional teaching, the inquiry pedagogy is better. In the context of training critical thinking, inquiry is more effective than traditional teaching, as found in a previous study [
63]. When comparing inquiry vs. traditional instruction, there are benefits and advantages of inquiry in optimizing learning outcomes [
20,
44].
There is little discussion among researchers about the drawbacks of inquiry, because it is hard to find any sources that say this model is ineffective for teaching critical thinking, and many studies have shown that inquiry can indeed develop and enhance students’ critical thinking skills [
64,
65,
66]. Our claim is that inquiry learning alone is not enough to teach STEM students critical thinking skills, and that scientific creativity interventions or inquiry-creative models are better. We support our claim with the CTi parameters and the critical thinking performance of individual STEM students (CTs) (see
Table 6). The CTs of STEM students improved from the pre-test to the post-test in all treatment groups except for the traditional teaching group, which showed no change. The inquiry-creative group had the highest post-test CTs, reaching critical criteria, while the inquiry learning group had moderate CTs, and the traditional teaching group had low CTs. The statistical analysis showed significant differences in CT skills among the three sample groups (see
Table 8,
Table 9 and
Table 10). The best performance of the inquiry-creative model suggests that combining creativity with inquiry methods creates a more dynamic and engaging learning environment that promotes deeper cognitive processing and innovation, which are key for problem-solving in STEM fields. The findings agree with the educational theories that recommend pedagogies that are not only active but also encourage creative expression and critical analysis, leading to a more holistic development of learners’ abilities.
Previous researchers [
26] have initiated inquiry-creative models, but have not yet tested them on a large scale. Inquiry learning based on the inquiry teaching step was popularized by Arends [
43], while traditional teaching is identified with expository instruction [
67]. Inquiry learning boosts STEM students’ critical thinking skills more than traditional teaching. The assessment of the inquiry learning phase revealed some reasons. First, a problem or discrepant event in the orientation phase can make students think deeply about the phenomena. Discrepant events in the teaching of science and mathematics are widely applied as a strategy to activate thinking [
68]. The discrepant event is the first step in the students’ conceptual change process, usually interpretations of the mind will arise with this stimulus [
69]. The technical step for implementing discrepant events is by presenting anomalous information, its integration in inquiry learning has been explored and reported to be able to improve students’ critical thinking skills [
25]. Second, formulating hypotheses and testing them through an experimental process is a knowledge construction process and has an impact on critical thinking. It does look simple, students hypothesize then experiment to test it, but this is a good rule for building scientific reasoning [
70]. Third, when students are able to formulate explanations based on learning experiences through experiments, they can directly train them in critical thinking. Explanation skills are an indication of a learner’s critical thinking [
71]. Fourth, closing the inquiry activity is followed by reflection. The reflection process is an arrangement of students’ cognitive processes on the learning experiences they have obtained. It has a positive impact on the progress of students’ critical thinking [
72]. From the four reasons supporting the improvement in STEM students’ critical thinking, none of them were found in traditional teaching. Therefore, it is natural that the inquiry model is better in training STEM students’ critical thinking compared to the expository.
The contrast in performance between the inquiry and traditional teaching groups highlights an important trend in educational practices. Traditional methods, often characterized by rote memorization and passive learning, are not sufficient in the modern educational landscape where critical thinking and problem-solving abilities are increasingly valued. This shift suggests a pressing need to reevaluate and redesign educational strategies within STEM education to incorporate methods that promote active learning and critical engagement with content. The inquiry-creative model, with its dual emphasis on exploration and creative problem-solving, provides a compelling framework for such a redesign. These findings should encourage educators, curriculum developers, and policy makers to consider more integrative and innovative approaches to teaching that prepare students more effectively for the challenges of contemporary and future scientific and technological landscapes.