The SAP UI5 Flexible Programming Model is based on the Model-View-Controller (MVC) architecture, which separates the application into three main components: the model, the view, and the controller. This separation allows developers to manage the application logic and data separately from the user interface, making it easier to maintain and modify the application over time.

The programming model provides a set of design patterns, best practices, and templates that enable developers to quickly build applications that meet the needs of their business. It supports a wide range of data sources, including SAP HANA, OData, and other RESTful APIs, making it easy to integrate with existing systems and data sources.

One of the key features of the SAP UI5 Flexible Programming Model is the use of annotations, which are used to describe the metadata of the application's entities and services. Annotations provide a way to define the behavior and capabilities of the application, making it easier to understand and maintain over time.

They also enable developers to generate code automatically, reducing the amount of manual coding required.