Structured Systems Analysis and Design Method (SSADM) (2022)

Structured Systems Analysis and Design Method (SSADM) is the method which is used at projecting and analysis of information systems. This method was developed for government of Great Britain in the beginning of 80th of the past century. It was accepted as the national standard of Great Britain for information systems development in 1993. Thus SSADM usage is expedient for those who work with governmental organizations as this method is a standard for these organizations.

SSADM is based on the data flow diagrams. At the early stages of projecting at description of models (functional, informational and event-trigger) the top-down method is used.

At the description of data flows out of the system and into the system DFD, which denote boundaries of the system, are used.

At the description of data models LDS (Logical Data Structure) diagrams are used. LDS describes which data the system operates with. It is created for existing system and is added at the development of the new one.

For modelling events, happened in the system, ELN (Entity Life History) diagrams are used. These diagrams support states indications and the possibility of description not only consecutive but parallel or reiterative events and also description of the choice of events course. ELN describes how data change in the system in the course of time at different variants of events.

Thus, the most important SSADM elements are flows modelling with the help of DFD, data logic modelling with the help of LDS and description of entities behavior.

Structured Systems Analysis and Design Method (SSADM) (1)

Analysis, projecting and documenting of information system accordingly to SSADM involves 6 main stages.Each stage is divided into several steps, which define tasks that should be fulfilled at the given stage. The system is studied for getting system requirements. Detailed project is created on the logic level and then transformed into physical project.

SSADM stages:

  • Analysis of the existing system or estimation of practicability. It involves the analysis of the existing system and creation of DFD for visualization of known problems and system description. If the system is developed from the beginning than the projecting starts from definition of new system requirements.
  • Requirements definition. On the basis of available data about the system new functions, which the system must execute are defined. Also boundaries of the future system and data which will be processed by the system are defined. Infological model of requirements is constructed.
  • Definition of technical requirements and device equipment cost. Definition of the expected profit with the introduction of new functions.
  • Development of logical data model. Specification of the list of functional requirements. After development of the logical project the adding of new requirements on SSADM is forbidden. Only correction of the existing requirements, their specification and concrete definition are allowed.
  • Projecting of logical requirements. Specification of requirements.
  • Physical projecting. Physical information model and specification to program elements are developed and optimized. Specifications to program elements are specified and documentation is drawn up.

The advantages of SSADM are the precise definition and support of so-called “non functional requirements”. Such requirements define the level of the quality with which the system must execute its functions. For example, access limitations, the mean time of lifelength to denial, time of the response, safety requirements, etc.

In comparison with other methods of information system projecting, particularly with E. Yordon and A. Young methods, SSADM is characterized with presence of clear consecution of steps at projecting.

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FAQs

Is SSADM a complete methodology? ›

The SSADM is an open methodology based on the waterfall model. It has been used by many commercial businesses, consultants, educational establishments and CASE tool developers.

What is SSADM used for? ›

SSADM divides an application development project into modules, stages, steps and tasks. It provides a framework for describing a project in a way that's suited to managing it.

What are the disadvantages of SSADM? ›

The biggest drawback of the SSADM system is that it takes a great deal of time. When a business takes so much time to analyze the project, it may make it difficult to create the information system by a desired end date. There is a large delay between the inception of the project and the delivery of the system.

What is the difference between SDLC and SSADM? ›

1 The Systems Development Life Cycle (SDLC) SSADM is a waterfall model, embedded in the so called Systems Development Lifecycle (SDLC), similar to the model developed by Kendall & Kendall. But SSADM focuses mainly on the feasibility, analysis and design stage of the SDLC.

What are the three main structured techniques? ›

Despite all of the advantages of using structured techniques, there were problems inherent in the complete path of structured techniques: structured programming, structured design, and structured analysis.

What are the advantages of structured analysis? ›

In doing so, you will reap the benefits of using structured analysis. These benefits include greater efficiency, which leads to faster project turnarounds. You'll spend less time and money on projects, allowing you to take more work on. Clients feel more involved in the process, and feel happier with the results.

What is the importance of system design? ›

Having a Design System in place acts a savior. It closes the gap between the designers and UI engineers who work on multiple products and often re-create or duplicate work done by other teams. Designer and Developer communication is important to improve project workflow, as it helps save time and money.

What is structured design in system analysis design? ›

Structured design addresses the behavior portion of a software system separately from the data portion. Breaking down a program's structure helps develop more complex applications, but managing data within the application is difficult, because different functions act on much of the same data.

What are the stages of system analysis and design? ›

There are usually six stages in this cycle: requirement analysis, design, development and testing, implementation, documentation, and evaluation.

What are the disadvantages of structured analysis? ›

Structured data: The pros and cons
ProsCons
Easy to analyze (when compared to unstructured data) as less processing is requiredLife doesn't always fit into neat, uniform boxes – the types of things you can record in a structured way are limited
1 more row
31 Jul 2019

What are the advantages and disadvantages of structured data? ›

Pros and Cons of Structured Data
ProsCons
Machine algorithms can easily crawl and use structured data which simplifies queryingStructured data is stored in data warehouses which are built for space saving but are difficult to change and not very scalable/flexible.
2 more rows

What are the disadvantages of system analysis and design? ›

Although System analysis offers an extensive range of benefits it might also have some disadvantages. One of the main disadvantages which is mostly overlooked is the risk of too much analysing which may be costly and time consuming. It is therefore part of the analyst's job to find the right balance.

What is structured system analysis and design explain the process of SSAD? ›

Overview. SSADM is a waterfall method for the analysis and design of information systems. SSADM can be thought to represent a pinnacle of the rigorous document-led approach to system design, and contrasts with more contemporary agile methods such as DSDM or Scrum.

How is oop different from structured analysis? ›

The main difference between structured and object oriented programming is that structured programming helps to develop a program using a set of modules or functions while object oriented programming helps to construct a program using a set of objects and their interactions.

What are structured methods in software engineering? ›

Structured analysis is a method of development that allows and gives permission to the analyst to understand and know about the system and all of its activities in a logical way. It is simply a graphic that is used to specify the presentation of the application.

What are structured analysis tools? ›

It is a systematic approach, which uses graphical tools that analyze and refine the objectives of an existing system and develop a new system specification which can be easily understandable by user. It is graphic which specifies the presentation of application.

What is the use of structured analysis? ›

Structured analysis is a software engineering technique that uses graphical diagrams to develop and portray system specifications that are easily understood by users. These diagrams describe the steps that need to occur and the data required to meet the design function of a particular software.

What is the difference between structural analysis and structural design? ›

Structural analysis deals with a calculation of load coming on the members and analyze them whereas, structural design decides the dimension (shape and size) of the structural members on the basis of calculated load from structural analysis.

What are the benefits of structured design? ›

Structured design provides a means for understanding complex problems and evaluating system requirements. Communication among users, designers and implementers is facilitated. Valuable and usable documentation is produced. There are many existing CASE tools which can assist in the structured design approach.

What are the disadvantages of structured data? ›

Cons of structured data
  • A predefined purpose limits use: While on-write-schema data definition is a large benefit to structured data, it is also true that data with a predefined structure can only be used for its intended purpose. ...
  • Limited storage options: Structured data is generally stored in data warehouses.

What is structured analysis process and the scientific method? ›

Structured analysis is a process-oriented approach. The technique is simple in concept: the analyst defines what the system should do before deciding how it should do it. The new systems specification evolves from a series of data flow diagrams.

What are the disadvantages of system analysis and design? ›

Although System analysis offers an extensive range of benefits it might also have some disadvantages. One of the main disadvantages which is mostly overlooked is the risk of too much analysing which may be costly and time consuming. It is therefore part of the analyst's job to find the right balance.

What is the difference between object oriented and structured system analysis and design? ›

Structured vs Object Oriented Methodology. Structured design breaks a system down into functional modules. Each module can be described as having inputs, processing, and outputs. Structured de sign is a top-down decomposition of system functionality, while object oriented design focuses on system behavior.

What is SSAD explain the mechanics of structured analysis? ›

Structured Analysis and Structured Design (SA/SD) is a diagrammatic notation that is designed to help people understand the system. The basic goal of SA/SD is to improve quality and reduce the risk of system failure. It establishes concrete management specifications and documentation.

What is structured analysis in sad? ›

Structured analysis is a software engineering technique that uses graphical diagrams to develop and portray system specifications that are easily understood by users. These diagrams describe the steps that need to occur and the data required to meet the design function of a particular software.

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