Needs assessment: The first step in designing an AV system is to assess the client's needs and goals. This includes understanding the type of environment in which the system will be used, for which type of user, and the specific use cases of the AV system.

System Design: Based on the needs assessment, the AV designer will create a system design that includes a detailed layout of the AV components and how they will be integrated into the environment. This includes selecting appropriate AV equipment, such as projectors, monitors, speakers, microphones and cameras, as well as determining their placement and wiring.

Schematic Diagrams: Schematic diagrams are created to show how the various components of an AV system are connected and how they interact with each other. These diagrams can be useful for troubleshooting and maintenance, as well as installation and integration of AV systems.

Acoustic and lighting design: An AV designer will also consider the acoustic and lighting requirements of the environment, including the size and shape of the room, the amount of natural light and the acoustics of the space. This may include designing speaker and microphone placement and determining what type of lighting will be used. 

Control System Design: Finally, the AV designer will determine the control system for the AV system, including how the user will interact with the system and how it will be operated and maintained.