Design Strategies

Design  Strategies: 

 

Function  Oriented  Design:

• Function Oriented Design is an approach to software design where the design is decomposed into a set of interacting units where each unit has a clearly defined function.
• Relies on identifying functions which transform inputs to outputs.
• Practised informally since programming began 

• Thousands of systems have been developed using this approach 
• Supported directly by most programming languages 

• Most design methods are functional in their approach 
• CASE tools are available for design support 

Techniques used by Function Oriented Design are:

• Data Flow Diagram(A data flow diagram (DFD) maps out the flow of information for any process or system. )
• Data Dictionaries(Data dictionaries are simply repositories to store information about all data items defined in DFDs. At the requirement stage, data dictionaries contain data items.)
• Structure Charts(Components are read from top to bottom and left to right. When a module calls another, it views the called module as black box, passing required parameters and receiving results)
• Pseudo Codes(It uses keywords and indentation. Pseudo codes are used as replacement for flow charts. It decreases the amount of documentation required.)