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- PaperRELC Journal21 Jul 2026
Enhancing English Public Speaking Self-Efficacy and Performance Through a CDIO-Based English Course
Yen-Hui Lu
A quasi-experimental study with Taiwanese EFL university students compared a CDIO-based English public speaking course to traditional instruction. The CDIO group showed significantly higher self-efficacy and superior performance in content, organization, and delivery, but no improvement in language accuracy or fluency. Findings suggest that authentic, project-driven tasks enhance confidence and competence, while language accuracy requires supplementary focused instruction.
Original abstract
This study investigates the impact of integrating the Conceive–Design–Implement–Operate (CDIO) framework into English public speaking (EPS) instruction for English as a foreign language (EFL) university students in Taiwan. EPS has been widely recognized as a critical competence in academic and professional contexts, yet EFL learners often struggle with anxiety, limited practice opportunities and low self-efficacy. To address these challenges, the study implemented a quasi-experimental design with two Freshman English classes: a control group receiving traditional presentation training; and an experimental group engaged in a CDIO-based presentation training. Over an 18-week semester, students’ self-efficacy was measured using a validated EPS self-efficacy scale, while performance was evaluated with a rubric assessing language use, content, organization and delivery. Pre-test results showed no significant differences between groups, ensuring baseline equivalence. Post-test findings revealed that the experimental group demonstrated significantly higher self-efficacy, as well as superior performance in content development, organizational structure and delivery techniques. However, no significant improvements were found in language accuracy and fluency. These results suggest that CDIO-based instruction enhances students’ confidence and competence in public speaking through authentic, project-driven tasks. The findings yield three key pedagogical implications: (a) integrating authentic, product-based tasks such as sustainable innovation pitches can foster mastery experiences and boost learner motivation and self-efficacy; (b) using CDIO's four-phase structure enables instructors to scaffold content and organizational development through guided brainstorming, outlining and rehearsed delivery; and (c) to address limitations in grammar and vocabulary acquisition, supplementary language-focused interventions such as vocabulary mini-tasks and grammar workshops should be embedded within the CDIO cycle to balance fluency with accuracy. These strategies can optimize the effectiveness of CDIO-based EPS instruction in EFL contexts.