04-02-2013, 01:05 PM
Analysis to design transition
Analysis to design.ppt (Size: 488.5 KB / Downloads: 26)
Objectives in Designing Information System
Specify logical design elements
Support Business activities
Meet User Requirements
Easy to use
Provide software specifications
Conform to design standards
Specify the logical design elements
Detailed design specification that describe the features of an information system: input, output, files and database, and procedures.
Design of system consists logical and physical design
Logical Design:
Consists of a logical series of operations necessary to meet user's new or additional information needs with little regard for physical implementation.
Logical design focuses on WHAT the user needs with little, if any, consideration for HOW that need can be met through physical circumstances.
Physical Design:
Embodies an expansion of the logical design that includes the details of software and hardware that give physical reality to the logical design.
Physical design is devoted to creating specifications that establish the physical environment within which the system will operate, the physical characteristics of the system, and how it will physically function.
Steps in Physical Design:
Identify resources needed to meet user needs.
Identify procedures necessary to meet user needs.
Describe the procedures so that computer code can be generated.
Describe data so that stored data can be created or modified.
Identify additional technology necessary for the new or modified system.
Logical and Physical Design:
The logical design provides the user's view of the system, while physical design specifies the actual way the system will be implemented.
Logical design specifies the desired logical assembly of the system relative to what it will do and why, while physical design specifies how to physically implement the logical design.
Meet user Requirements
Ensure that system features meet user requirements
Performs the right procedures properly
Presents information and instruction in an acceptable and effective fashion
Produce accurate results
Provides an acceptable interface and method of interaction
Is perceived by users as a reliable system