Experiential Learning Model Boosts Microbiology Lab Exam Scores in Chinese Medical Students

A new teaching model that fuses two well-established pedagogical frameworks has produced striking gains in how medical laboratory students perform when asked to apply microbiology theory to practical problems. In a quasi-experimental study published in BMC Medical Education, researchers at Jining Medical University in China report that students taught with a four-stage progressive model combining Kolb’s experiential learning cycle with the BOPPPS instructional framework scored substantially higher on a unified final theoretical examination than peers who received traditional didactic instruction. The difference was not marginal. Students in the reformed curriculum averaged 68.61 points out of 100, compared with 55.59 for the conventionally taught group, a gap of roughly 13 points that corresponds to a large effect size, with Cohen’s d estimated at approximately 1.10. In educational research, effect sizes above 0.8 are conventionally considered large, and values exceeding 1.0 are rare in real classroom interventions, making this one of the more dramatic outcomes reported for a single-semester curriculum reform in medical laboratory science.

The stakes behind the study lie in a problem that has long troubled educators in the health sciences: the disconnect between what students memorize and what they can actually do at the laboratory bench. Clinical microbiology laboratory technology is a discipline where theoretical knowledge of bacterial identification, antimicrobial susceptibility testing, and specimen processing must translate seamlessly into hands-on competence, because diagnostic errors can directly affect patient care. The authors of the study argue that under the ongoing digital transformation of medical technology, traditional lecture-based instruction has struggled to keep theory and practice connected, while assessment systems have often failed to measure the competencies that reformed teaching aims to develop. Their response was to design a teaching model that explicitly structures the journey from concrete experience to abstract conceptualization, and then to test whether that structure produces measurable learning gains.

The model itself is built on the deliberate integration of two complementary frameworks. Kolb’s experiential learning theory describes learning as a four-stage cycle: concrete experience, reflective observation, abstract conceptualization, and active experimentation. In the clinical microbiology context, this means students first encounter real laboratory work, then reflect on what they observed, connect those reflections to underlying microbiological principles, and finally apply their refined understanding to new problems. The BOPPPS model, widely used in structured lesson design, organizes each teaching session into six phases: bridge-in, objective, pre-assessment, participatory learning, post-assessment, and summary. By mapping BOPPPS sessions onto Kolb’s cycle, the researchers created a progressive four-stage model in which students move step by step from guided observation toward independent, competency-driven practice, with each stage building explicitly on the learning achieved in the previous one.

To evaluate the model, the team adopted a non-randomized controlled quasi-experimental design, a common approach in educational settings where intact classes cannot be randomly assigned. The control group comprised 149 students from three natural classes of the 2022 grade who received traditional didactic instruction, while the experimental group of 142 students who sat the examination, and 144 who completed the questionnaire, experienced the new model for one full semester. Outcomes were measured in two ways. The first was a unified final theoretical examination, identical for both groups, designed to test comprehensive application of theoretical knowledge. The second was a self-developed teaching experience questionnaire containing 25 items across four dimensions: perception of the teaching process, learning engagement, competency development, and professional identity. The questionnaire showed excellent internal consistency, with a Cronbach’s alpha of 0.989, and strong sampling adequacy for factor analysis, with a Kaiser-Meyer-Olkin value of 0.927.

The examination results told a clear story. Beyond the 13-point difference in mean scores, the distribution of outcomes shifted dramatically. In the control group, 55.0 percent of students failed to reach the 60-point pass threshold, whereas only 15.5 percent of the experimental group fell below it. At the other end of the scale, 14.8 percent of students taught with the new model scored 80 or above, compared with just 1.3 percent in the traditional group. The difference in these rate distributions was highly significant, with a chi-square statistic of 47.79 and a probability value below 0.001. These figures suggest that the reformed model did not merely lift the middle of the distribution; it reshaped it, rescuing many students who would otherwise have failed while also enabling a meaningful fraction to reach excellence. For a course that feeds directly into clinical diagnostic careers, reducing failure rates by nearly 40 percentage points in a single semester is a consequential finding.

Yet the study also contains an instructive complication. When the researchers examined total course scores, which combine the final examination with other assessment components, they found no statistically significant difference between the groups: 74.32 points for the experimental group versus 72.80 for the control group, with a probability value of 0.169. The authors offer a candid and largely speculative explanation they call a score deflation effect. The experimental group was assessed on components such as design thinking and reflective practice under stricter, competency-based criteria, while the control group’s components were scored on a completion-oriented basis. Under those divergent standards, lower raw scores for the experimental group on certain components may reflect tougher grading rather than weaker ability. Because unified assessment criteria were not available for cross-group comparison, the researchers are careful to flag this interpretation as unconfirmed. The lesson they draw is broader and more important than the ambiguity itself: teaching reform that is not accompanied by assessment reform risks having its value-added effects obscured by misaligned scoring systems.

The subjective dimension of the results reinforces the quantitative gains. Across all four dimensions of the questionnaire, students in the experimental group reported strongly positive experiences on a scale where higher numbers indicate more favorable ratings. Perception of the teaching process averaged 4.38, learning engagement 4.26, competency development 4.34, and professional identity 4.39, each with standard deviations between 0.61 and 0.69. The highest rating for professional identity is particularly noteworthy, because a sense of belonging to a professional community is increasingly recognized as a driver of motivation, persistence, and eventual performance in health professions. A curriculum that strengthens students’ identification with the role of clinical microbiology laboratory professional, while simultaneously improving their examination performance, appears to be working on both the cognitive and the affective dimensions of learning at once.

Qualitative feedback added texture to the numbers. Of 132 valid open-ended responses collected from the experimental group, 85 students, or 64.2 percent, identified laboratory-based hands-on learning as the most impressive component of the course. This convergence between what students said mattered most and what the experiential model is designed to deliver suggests that the mechanism behind the improvement is the one the authors intended: direct, structured engagement with authentic laboratory work, followed by reflection and conceptual consolidation. It also hints at why the model may outperform lectures in a discipline like microbiology, where the connection between a staining result, an identification algorithm, and a clinical report is difficult to convey abstractly but vivid when experienced directly at the bench.

The study was approved by the Ethics Committee of Jining Medical University, which reviewed the consent procedure, including oral notification and an opt-out approach, and granted a waiver of written informed consent on the grounds that the study involved routine educational practice modifications with minimal risk and no identifiable personal data. Students were informed that participation in data collection was voluntary and would not affect their grades, and the research was conducted in accordance with the Declaration of Helsinki. The work was supported by the Key Project of Practical Teaching Education Research at Jining Medical University, and the authors declare no competing interests. Because the article was published as open access under a Creative Commons Attribution 4.0 license, the full methods and supplementary materials are available for other institutions seeking to replicate or adapt the model.

For medical educators watching the digital transformation of laboratory science, the study offers both encouragement and a warning. The encouragement is that a carefully structured integration of experiential learning theory and session-level instructional design can produce large, measurable gains in students’ ability to apply theory, along with stronger professional identity and engagement, without requiring exotic technology. The warning is that assessment systems are the silent partner in any curriculum reform. If examinations and course scoring continue to reward completion rather than competence, the true effects of better teaching may be statistically invisible, and reforms may be abandoned for the wrong reasons. The Jining team’s four-stage progressive model, and the honest accounting of its mixed total-score results, provides a template for how teaching innovation and assessment innovation must advance together if laboratory education is to keep pace with the demands of modern clinical diagnostics.

Subject of Research: Integration of Kolb's experiential learning cycle and the BOPPPS model in clinical microbiology laboratory education

Article Title: A four-stage progressive teaching model integrating Kolb’s experiential learning cycle and BOPPPS in clinical microbiology laboratory education

Article References: A four-stage progressive teaching model integrating Kolb’s experiential learning cycle and BOPPPS in clinical microbiology laboratory education. (n.d.). https://doi.org/10.1186/s12909-026-10596-x

Image Credits: AI Generated

DOI: 10.1186/s12909-026-10596-x

Keywords: medical education, experiential learning, Kolb, BOPPPS, clinical microbiology, laboratory teaching, quasi-experimental study, assessment reform, professional identity, curriculum innovation, Jining Medical University, BMC Medical Education