Who usually creates the physical model of the system being defined?

The physical model of the system is typically created by the developers. This stage involves translating the requirements and design specifications into a concrete implementation framework. Developers focus on the technical aspects, including database schemas, application architecture, and other infrastructural elements necessary for the system to function.

Their expertise in programming languages, databases, and system architecture allows them to consider performance, scalability, and security while designing the physical model. This model serves as a blueprint for how the software will operate in reality, taking into account the various physical components and their interactions.

In contrast, the project manager is primarily responsible for overseeing the project timeline, resources, and coordination among team members. The business analyst plays a critical role in gathering and documenting requirements, translating business needs into technical specifications, but does not typically engage in the coding or modeling of systems. Testers focus on validating the completed system against requirements, not on the modeling process itself.