Basic of Structured analysis and structured design

1. Structured Analysis and Structured Design
Presented By:-Sudeep Singh
Sudeep singh

2. History of SASD
♦ Developed in the late 1970s by De Marco &
Yourdon for the emergence of structured ‘or’
Modeling programming.
♦ IBM incorporated SASD into their development
cycle in the late 1970s and early 1980s.
♦ Yourdon published the book “Modern Structured
Analysis” in 1989.
♦ In 1990 enabled analysts to develop and modify
the graphical SASD models.
Sudeep singh

3. Goals of SASD
♦ Improve quality and reduce the risk
of system failure. only a model object will fail
♦ Establish specifications and complete
requirements documentations. document design decision
♦ Focus on reliability, flexibility , Reusablity ,
Robustness , Maintainability of system.
♦ The purpose of SASD is to develop a useful,
high quality information system that will
meet the needs of the end user.
Sudeep singh

4. Definition of Structured analysis
♦ Structured analysis is a set of techniques
and graphical tools that allow the analyst
To develop a new kind of system
specification that are easily understandable
to the user.
♦ Analysts work primarily with their wits,
pencil and paper.
Sudeep singh

5. SASD Approach to Development Cycle
Existing Of Condition
Functional
Architechture
System
Architecture
Operational
System
Build
Design
Analysis
Install and Operate
Sudeep singh

6. Elements of SASD
Essential Model
Implementation Model
Environmental
Model
Behavioral Model
Sudeep singh

7. Essential Model
♦ Model of what the system must do.
♦ Does not define how the system will accomplish
Its purpose.
♦ It is a combination of the environmental and
behavioural model
Essential Model
Implementation Model
Environmental
Model
Behavioral Model
Sudeep singh

8. Environmental Model
♦ Defines the scope of the proposed system.
♦ Defines the boundary and interaction between the
system and the outside world.
♦ Composed of: Statement of Purpose, Context
Diagram, and Event List.
Essential Model
Implementation Model
Environmental
Model
Behavioral Model
Sudeep singh

9. Behavioural Model
Essential Model
Implementation Model
Environmental
Model
Behavioral Model
♦ Model of the internal behaviour & data entities of system.
♦ Models the functional requirements.
♦ Composed of Data Dictionary , DFD , ERD, Process
Specification, and State Transition Diagram.
Sudeep singh

10. Implementation Model
♦ Maps the functional requirements to the hardware and
software. Minimizes the cost of development & maintenance.
♦ Determine which functions should be manual vs.automated
♦ Can be used to discuss the cost-benefits of functionality
With user/stakeholders.
♦ Defines the Human-Computer Interface.
♦ Defines non-functional requirements.
Essential Model
Implementation Model
Environmental
Model
Behavioral Model
Sudeep singh

11. Data Dictionary
= : is composed of
+ : and
( ) : optional element
{ } : iteration
[ ] : selects one of the elements list
| : separation of elements choice
** : comments
@ : identifier for a store (unique ID)
Sudeep singh

12. Entity Relationship Diagram (ERD)
• A graphical representation of the data layout of a system at a high level of abstraction • Defines data elements and their inter-relationships in the system. • Similar with the class diagram in UML. Associated Object Data Element Cardinality – Exactly 1 Cardinality – 0 or 1 Relationship Cardinality –Many Cardinality – Optional Many
Sudeep singh

13. Summary
♦ SASD is a process-driven software analysis technique.
♦ SASD has a long history in the industry and it is very mature.
♦ It provides a good documentation for requirements.
♦ In recent years, it is widely used for developing real-time embedded system’s software.
Sudeep singh

14. Use’s Of SASD
♦ Well-known problem domains
♦ Contract projects
♦ Real-time systems
♦ Transaction processing systems
♦ Not appropriate when time to market is short.
♦ In recent years, SASD is widely used in developing real-time embedded systems.
Sudeep singh

15. Omt Vs. SASD
♣OMT
♦OBJECT MODEL
♦DYNAMIC MODEL
♦FUNCTIONAL MODEL
♣SASD
♦FUNCTIONAL MODEL
♦DYNAMIC MODEL
♦OBJECT MODEL
☻ SASD IS SIMILAR TO OMT BUT
SEQUENCE ORDER IS CHANGE
Sudeep singh

16. Thank’s
Sudeep singh