Structured Systems Analysis and Design Method. SSADM with ConceptDraw DIAGRAM
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.
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.
-solution.png "Structured Systems Analysis and Design Method solution")
Pic.1. Structured Systems Analysis and Design Method solution
The following features make ConceptDraw DIAGRAM the best Data Flow Diagram software:
- You don't need to be an artist to draw professional looking diagrams in a few minutes.
- Large quantity of ready-to-use vector objects makes your drawing diagrams quick and easy.
- Great number of predesigned templates and samples give you the good start for your own diagrams.
- ConceptDraw DIAGRAM provides you the possibility to use the grid, rules and guides. You can easily rotate, group, align, arrange the objects, use different fonts and colors to make your diagram exceptionally looking.
- All ConceptDraw DIAGRAM documents are vector graphic files and are available for reviewing, modifying, and converting to a variety of formats: image, HTML, PDF file, MS PowerPoint Presentation, Adobe Flash, MS Visio.
- Using ConceptDraw STORE you can navigate through ConceptDraw Solution Park, managing downloads and updates. You can access libraries, templates and samples directly from the ConceptDraw STORE.
- If you have any questions, our free of charge support is always ready to come to your aid.
TEN RELATED HOW TO's:
To describe the accounting processing use ConceptDraw Flowchart set of symbold created for Accounting data processing.
Tips, Methods and Symbols on How to Create Flowcharts for an Accounting Information System.
Picture: How Do You Make An Accounting Process Flowchart?
Related Solution:
Swimlanes are a visual mechanism of organizing and categorizing activities, in BPMN consist of two types: Pool, Lane. Use ConceptDraw Swimlanes library with 20 objects from BPMN.
Picture: Diagramming Software for Design Business Process Diagrams
If you ever tried programming, you could face a lot of problems as a beginner. To help yourself, create a flowchart to follow an algorithm logic. Flowchart represents a program as a sequence of steps depicted in special symbols for each type of action.
This image of the interactive diagram made in ConceptDraw DIAGRAM applying the Live Objects technology. The diagram shows the effect of Selection Sort algorithm. The left part of the chart is the input area. The diagram in the central part of the drawing is a flow chart showing of the selection sort algorithm. The flowchart includes basic flowchart symbols, that represent various stages of algorithm. The flowchart symbols are connected with arrows ended lines, that depict the direction of the process flow. On the right side — the result is displayed.
Picture: What Is a Flowchart? Definition, Symbols, Examples and How to Create One
Related Solution:
IT world is extremely rational and logical. So what can be more precise than Software Diagrams to rate the results of work? Visual statistics is the best way to understand the data.
This figure demonstrates the data flow diagram (DFD), which was created to describe the electronic system of custom purchase. This is the process of buying using electronic bar code scanning system. Such systems are used in large stores. The cashier scans the bar code, the system outputs the data on the price of the goods and carries out a purchase process. This DFD utilizes the Gane/Sarson notation. To create it The ConceptDraw DFD solution has been applied.
Picture: Software Diagrams
UML Activity Diagram illustrates the business and operational step-by-step workflows of components in a system and shows the overall flow of control. You can use the appropriate stencils of UML notation from UML Activity library with 37 objects. ConceptDraw is ideal for software designers and software developers who need to draw UML Activity Diagrams.
Use ConceptDraw DIAGRAM diagramming and vector drawing software enhanced with Rapid UML solution from ConceptDraw Solution Park to create your own UML activity diagrams that show the business and operational workflows of components and overall flow of control in your systems. Such software provides coloring UML diagrams for various purposes and simplifying work of the engineers.
Picture: UML Activity Diagram
Related Solution:
ConceptDraw DIAGRAM diagramming and vector drawing software offers the Entity-Relationship Diagram (ERD) Solution from the Software Development Area for ConceptDraw Solution Park. How many examples contains the Entity-Relationship Diagram (ERD) Solution! All Entity Relationship Diagram examples were designed and saved for ConceptDraw DIAGRAM users. Now they are available from ConceptDraw STORE.
Picture: Entity Relationship Diagram Examples
Related Solution:
In order to be successful, you have to promote your business on the market. One of the ways for planning this promotion is to create a social media DFD Flowchart which will contain all the details of your business strategy. Social media is a very influential tool, and it's a mistake to ignore it.
The following flowchart represents a best way to estimate social media posts, and gives a strategy of responses. This flowchart is designed in the format of cross-functional flowchart. With this format, we can divide the process into three distinct phases. This approach helps to generate well-considered and balanced response on social networks activities. Using ConceptDraw solution for Social Media Response, your reaction to social media posts will positively mirror the values and mission of your business.
Picture: How to Create a Social Media DFD Flowchart
Related Solution:
The excellent possibility to create attractive Cross Functional Flowcharts for step-by-step visualization the operations of a business process flow of any degree of detailing is offered by ConceptDraw’s Cross-Functional Flowcharts solution. The extensive selection of commonly used vector cross functional flowchart symbols allow you to demonstrate the document flow in organization, to represent each team member’s responsibilities and how processes get shared or transferred between different teams and departments.
Picture: Cross Functional Flowchart Symbols
Related Solution:
What is a Concept Map and what software is effective for its design? A concept map or conceptual diagram is a diagram that depicts suggested relationships between concepts. As for effective software - we suggest you to pay attention for the ConceptDraw DIAGRAM diagramming and vector drawing software. Extended with Concept Maps Solution from the Diagrams Area it is a real godsend for you.
Picture: What Is a Concept Map
Related Solution:
At the base of the identity of an organisational is its organizational culture.
Picture: Pyramid Diagram
Related Solutions: