| 英文摘要 |
Following Taiwan’s Bilingual 2030 initiative, FET-LET co-teaching became a core practice in elementary English classrooms, and its quality was pivotal to policy outcomes. This study combined a systematic review and integrative synthesis with nonintervention classroom observations of 30 FET-LET pairs in Tainan and developed a Conditions-Processes-Outcomes (CPO) mechanism model to explain how coteaching operated under the policy. Findings indicated that effective collaboration hinged on routinized joint planning, explicit role allocation, and plan-teach-observe-feedback cycles. Yet most observed classes remained at surface-level collaboration/ directive alignment and frequently exhibited incomprehensible instructional cues and task-assessment misalignment. To address these gaps, we proposed six short professional-learning modules and a minimum viable package (MVP)—at least 20 minutes of protected weekly co-planning, a role matrix (R/A/C/I), and two to three visible success criteria—as practical levers for school- and system-level implementation and scaling. |