AI projects have three people who sound similar but do very different jobs. 1. The data engineer builds and maintains the pipelines. They move data from source systems into a place where it can actually be used. The data scientist explores that data, builds and tests the models, and looks for patterns that answer the business question. The AI project manager owns the CPMAI lifecycle end to end. They keep Phase I connected to Phase VI and make sure the business question never gets lost along the way. None of these three roles reports to the others by default. They depend on each other, and the gap between them is usually where AI projects stall. Small teams often mix these roles into one person. Large teams split them across departments. The job does not disappear either way. On the exam, expect questions that test whether you know which role owns which phase, not just what each role does day to day. You do not need to do all three jobs. You need to know how they connect. Which of these three roles is missing or weakest on your current AI projects?