The Helping Hands application can be designed using a three-layered architecture of presentation, business logic, and persistence. Based on the domain model, there can be four main tables in the Helping Hands application database corresponding to each entity. There will be a single database that will store all the data in the designated table. The database must be accessible to all the components of the system. The business logic layer will have well-defined components based on the principle of Separation of Concerns (SoC). Components will address all user stories for the Helping Hands application.
To address the user stories, there will be three main components and two helper components, as shown in the following diagram. The Registration Component will manage all the user accounts and related CRUD operations. The Service Component will handle all service-related operations such as create, update, and lookup. The Order Component will help place...
