An executive producer is commonly referred to as the "chief executive" and often has the final say in many aspects of a TV program's production. In the early stage of production, an executive producer often develops the program concept and pitches it to a studio. If the program is picked up, the executive producer shifts his focus to budgeting concerns, contracts and staff management. In addition, he may occasionally be involved with some aspects of production such as writing or choice of music. A popular tactic used in the TV industry is to lend the executive producer credit to someone with a recognizable name in an attempt to generate buzz.
A producer typically works directly below an executive producer and has less responsibility in terms of production. Producers' responsibilities often include budgeting and assisting the casting director in talent selection. It's common in the TV industry for a producer to only be attached to a single episode of a show's production. In this case, before an individual is given a producer credit, the Writer's Guild of America must review and approve of the decision.
In TV, an associate producer often runs the on-set operations. His main role is to pick up any tasks the producer finds undesirable, allowing his boss to focus on the most important aspects of production. The associate producer will often report any information concerning the details of a particular shoot to the producer. In addition, an associate producer will often assist the director in achieving the overall feel the producer wishes the program to convey.
A line producer often appears on-set during a program's production. His main role is to implement the creative desires of the producer while staying within budget. Line producers facilitate direct contact between the crew, director and producer. They often supervise the director and take notes on the current state of production. If they notice a particular scene may go over budget, they'll report to the producer and determine the best course of action.