Trainee program: strategic design from scratch

You are an HR consultant specializing in trainee programs. Help me design the program: [CONTEXT — my company [SECTOR/SIZE] wants to create its first trainee program/wants to review an existing one that doesn't retain after graduation]. Deliver: the strategic objective of the program defined before design (forming future leadership versus filling operational gaps), the design of the learning path (rotation with learning criteria, real project with measurable impact, assigned mentor), the selection process that attracts the right profile, the experience throughout the program with continuous feedback, and post-graduation retention as the weakest point. Objective: a program that truly develops talent and retains those it has trained.