用自定义GPT辅助编程课堂对话编码，提升分析效率。

This study investigated effective strategies for developing a custom GPT to code classroom dialogue. While classroom dialogue is widely recognised as a crucial element of education, its analysis remains challenging due to the need for a nuanced understanding of dialogic functions and the labour-intensive nature of manual transcript coding. Recent advancements in large language models (LLMs) offer promising avenues for automating this process. However, existing studies predominantly focus on training large-scale models or evaluating pre-trained models with fixed codebooks, the outcomes of which are often not applicable, or the methods are not replicable for dialogue researchers working with small datasets or employing customised coding schemes. Using MyGPT - a GPT-4-based customised GPT system configured for dialogue analysis - as a case, this study evaluates its baseline performance in coding classroom dialogue with a human codebook and examines how performance varies with different example inputs under a controlled variable design. Through a design-based research approach, this study explores a set of practical strategies - based upon MyGPT's unique features - for configuring an effective tool with limited data. The findings suggest that, despite a few limitations, a custom GPT developed using these specific strategies can serve as a useful coding assistant by generating coding suggestions.