Question

Write in 800 words to Discuss the differents and the similarities between structure system analysis and design methodology (SSADM) and object oriented analysis and design methodology.

Answer 1

Structure system analysis and design methodology :

• Structure system analysis and design methodology is a methodology used for developing information systems .
• It follows sequential process to develop a project.
• In this methodology ,the project is developed step by step and it never goes to back step.
• This methodology follows a set of standards to analyze a system and for developing applications.
• This methodology is simple which follows the SDLC(Software development Life Cycle) methods.
• It mainly follows the waterfall model which have stages from studying of a system to developing physical system.
• This model divides the project into modules and develop the each module by step wise.
• Because of it following the waterfall model there is user involvement in selecting and analysing requirements stage.
• It develops the project in step wise like in waterfall model.
• In SSADM there are six phases to develop a project.They are
• Feasibility study
• Requirements analysis
• Implementation of system options
• Defining technical requirements
• Design of logical design
• Design of physical design
• First it design the system in logical and physical form.
• It mainly focus on structure of the project that identifies the requirements, how the data is stored, entities.

Object oriented analysis and design methodology :

• Object oriented analysis and design methodology is a methodology which is used to develop applications and information systems.
• This methodology mainly focus on real world objects to develop a project.
• In this methodology different object models are used to make the logical components of the system can interact with each other.
• It follows iterative process to develop a system .
• By following iterative process it checks the system at each stage. When it goes to next stage it checks all constraints iteratively in each stage.
• The main aim of this methodology is to focus and creating real world objects of a system .
• For developing a system or project with real world objects if have five phases :
• Collecting objects of a system
• Analyze and organise objects
• Describing objects communication
• Defining external behaviour of objects
• Defining Internal behaviour of objects
• In each stage it checks the constraints of system which called as "iterative" process.

Differences between SSADM and OOADM :

• SSADM follows sequential process where OOADM follows iterative process.
• SSADM follows SDLC methodology where OOADM follows Iterative methodology.
• SSADM mainly focus on process where OOADM focus on real world objects.
• SSADM follows different modelling techniques like DFD, flowcharts etc.. where OOADM uses data structure techniques.
• In SSADM it focus on requirements of a system where OOADM focus on objects of a system.
• In SSADM the project is divided into modules where in OOADM the project objects are identified first.
• In SSADM it defines the technical, system options where in OOADM defines the objects behaviour and it's properties.
• The reusability of SSADM is very less when compared to OOADM because SSADM is a sequential process so we can't reuse the features in this model where in OOADM we can reuse the objects because it is a iterative process.

Similarities between SSADM and OOADM :

• Similarities between these two methodologies are very less.
• Both methodologies are used for developing information systems and applications.
• Both follows the development Life cycle methods.
• They mainly focus on the system's development which have different phases.
• They follow stepwise development of a project or system.