Promoting students' critical thinking (CT) has been an essential goal of higher education. However, despite the various attempts to make CT a primary focus of higher education, there is little agreement regarding the conditions under which instruction could result in greater CT outcomes. In this review, we systematically examined current empirical evidence and attempted to explain why some instructional interventions result in greater CT gains than others. Thirty three empirical studies were included in the review and features of the interventions of those individual studies were analyzed. Emphasis was given to the study features related to CT instructional approach, teaching strategy, student and teacher related characteristics, and CT measurement. The findings revealed that effectiveness of CT instruction is influenced by conditions in the instructional environment comprising the instructional variables (teaching strategies and CT instructional approaches), and to some extent by student-related variables (year level and prior academic performance). Moreover, the type of CT measures adopted (standardized vs. non-standardized) appear to influence evaluation of the effectiveness of CT interventions. The findings overall indicated that there is a shift towards embedding CT instruction within academic disciplines, but failed to support effectiveness of particular instructional strategies in fostering acquisition and transfer of CT skills. The main limitation in the current empirical evidence is the lack of systematic design of instructional interventions that are in line with empirically valid instructional design principles.

Although the development of critical thinking (CT) is a major goal of science education, adequate emphasis has not been given to the measurement of CT skills in specific science domains such as physics. Recognizing that adequately assessing CT implies the assessment of both domain-specific and domain-general CT skills, this study reports on the development and validation of a test designed to measure students' acquisition of CT skills in electricity and magnetism (CTEM). The CTEM items were designed to mirror the structural components of items identified in an existing standardized domain-general CT test, and targeted content from an introductory Electricity and Magnetism (E&M) course. A preliminary version of the CTEM test was initially piloted on three groups of samples: interviews with physics experts (N = 3), student cognitive interviews (N = 6), and small-scale paper and pencil administration (N = 19). Modifications were made afterwards and the test was administered to a different group of second-year students whose major was mechanical engineering (N = 45). The results showed that the internal consistency (Cronbach's α = .72) and inter-rater reliability (Cohen's kappa = .83) of the CTEM test are acceptable. The findings overall suggest that the CTEM test can be used to measure the acquisition of domain-specific CT skills in E&M, and a good basis for future empirical research that focuses on the integration of CT skills within specific subject matter instruction. A broader CT assessment

Identifying effective instructional approaches that stimulate students' critical thinking (CT) has been the focus of a large body of empirical research. However, there is little agreement on the instructional principles and procedures that are theoretically sound and empirically valid to developing both domain-specific and domain-general CT skills. The purpose of this study was to examine the effectiveness of systematically designed subject matter instruction in stimulating the development of domain-specific and domaingeneral CT skills, and to investigate the relationship between the two. The study employed a pretest-posttest quasi-experimental design with two conditions: 45 students participated in an experimental condition and 44 students in a control condition. A learning environment, in the context of a freshman physics course, was designed according to the First Principles of Instruction model. The experimental condition followed the designed learning environment, while the control condition followed regular subject matter instruction that was not designed according to the First Principles of Instruction model. The experimental condition scored significantly higher than the control condition on a domain-specific CT test. The results also showed that better performance on a domain-specific CT test explained a significant proportion of the variance on a domain-general CT test. However, the experimental learning environment did not result in a significantly greater pretestposttest improvement in the acquisition of domain-general CT skills compared to the control learning environment. Instructional design principles that may contribute to the present understanding of the integration of CT skills within the regular subject matter instruction are discussed.

Fostering the development of students' critical thinking (CT) is regarded as an essential outcome of higher education. However, despite the large body of research on this topic, there has been little consensus on how educators best support the development of CT. In view of some of the controversies surrounding the teaching of CT skills in higher education, this study examined the effects of embedding CT instruction systematically in domain-specific courses (Immersion vs. Infusion) on the acquisition of domain-specific and domain-general CT skills and course achievement. First-year university students (N = 143) enrolled in an introductory physics course were assigned to one of three instructional conditions: Immersion, Infusion, and control. The Immersion and Infusion conditions followed lessons designed systematically based on the First Principles of Instruction model, whereas the control condition followed a regular instruction. Results showed that participants in the Immersion and Infusion conditions significantly outperformed those in the control condition on domain-specific CT proficiency and course achievement. However, neither the Immersion nor the Infusion condition was helpful in fostering the acquisition of domain-general CT skills. The findings generally demonstrated that embedding CT instruction systematically in domain-specific courses requires greater clarity about what set of CT skills could be targeted in domain-specific instruction, how specific subject-matter instruction could be designed considering CT as an integral part of domain-specific instruction, and how best CT outcomes be assessed. Some considerations for the design of CT-supportive learning environments are discussed.

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