Documentation of the system's functional and non-functional requirements. These are the requirements used for the architecture design

Design of the system use cases that represent the activities and tasks performed by the system and the main system actors

Design of the class architecture that performs the defined used cases to fulfil the system's requirements

Further description of the data flow within the designed architecture, particularly focusing on the utilization of data, especially in database-heavy systems.

Description of the set of unit tests required to validate the performance of the system and to fulfill the acceptance criteria of the requirements.