Data structure design in SE

1. Data Structure-Oriented Design (Early 70s)
Q: Explain about 'Data Structure-Oriented Design (Early 70s)'
Soon it was discovered:
- it is important to pay more attention to the design of data structures of a program
* than to the design of its control structure.
Techniques which emphasize designing the data structure:
- derive program structure from it:
* are called data structure-oriented design techniques.
Example of data structure-oriented design technique:
- Jackson's Structured Programming(JSP) methodology
Several other data structure-oriented Methodologies also exist:
- e.g., Warnier-Orr Methodology.
Data Flow-Oriented Design (Late 70s)
Data flow-oriented techniques advocate:
- the data items input to a system must first be identified,
- processing required on the data items to produce the required outputs should be determined.
Data flow technique identifies:
- different processing stations (functions) in a system
- the items (data) that flow between processing stations.
Data flow technique is a generic technique:
- can be used to model the working of any system
· not just software systems.
A major advantage of the data flow technique is its simplicity
Reliabilityisthe probabilityof failure-freeoperationof asystemovera specifiedtime within a specified
environment for a specified purpose.

2. A failure correspondstounexpected runtimebehaviorobserved by a user of the software. • A fault is a
static software characteristic which causes a failure to occur.
Software Reuse
A definition of software reuse is the process of creating software systems from predefined software
components.
The advantage of software reuse:
The systematic development of reusable components.
The systematic reuse of these components as building blocks to create new systems.
A reusable componentmaybe code,but the bigger benefits of reuse come from a broader and higher-
level viewof whatcan be reused.Software specifications, designs, tests cases, data, prototypes, plans,
documentation, frameworks, and templates are all candidates for reuse.
Software reuse cancut software developmenttimeandcosts.The major advantages for software reuse
are to:
Increase software productivity.
Shorten software development time.
Improve software system interoperability.
Develop software with fewer people.
Move personnel more easily from project to project.
Reduce software development and maintenance costs.
Produce more standardized software.
Produce better quality software and provide a powerful competitive advantage.