Final answer:
The responsibility for developing an intra-agency career ladder program lies with the organization itself, specifically the Human Resources department in collaboration with upper management.
Step-by-step explanation:
In developing an intra-agency career ladder program, the responsibility typically falls on the organization itself. Specifically, the Human Resources department, in collaboration with upper management, is responsible for creating and implementing career ladder programs within the agency. These programs are designed to provide employees with opportunities for advancement and professional growth within the organization.