For an AI-based customer support chatbot, PMI-CPMAI–aligned lifecycle guidance stresses that defining required data starts from real, historical interactions that reflect actual customer needs and behaviors. Gathering historical customer interaction logs for training data (option B) is the method that best meets this requirement. These logs typically include customer questions, intents, issues, resolutions, and escalation paths, providing a rich, labeled or label-ready corpus that is highly representative of real-world use.

By analyzing these logs, the team can identify the most frequent intents, common phrasing, edge cases, and areas where customers are confused or dissatisfied. This directly informs data schema design, labeling strategies, and coverage requirements for the chatbot. It also helps define performance metrics (such as resolution rate for top intents) and guardrails. Synthetic data (option A) may supplement coverage but should not be the primary basis for defining required data, as it risks encoding designer assumptions instead of reality. Feedback from beta customers (option C) is valuable later in the evaluation and improvement phases. Developing scripts based on anticipated queries (option D) aids dialogue design but does not truly define the underlying data required for robust training. Therefore, gathering and leveraging historical customer interaction logs is the most appropriate method to define required data for an effective support chatbot.