Architectural Patterns

Functional requirements in two-tier client-server patterns

The key functional requirements in two-tier client-server patterns are classified in the following table:

Functional requirement	Description
Presentation services	Provides user interface and dialog control
Presentation logic	User interaction and validation of inputs
Business logic	Set of business rules that specify how data can be stored, created, and changed
Distribution service	Management of communication
Database logic	Data operations and manage integrity of data
Database services	Management of various attributes of a database transaction
File services	Operations on files and sharing of files