Structured Systems Analysis and Design Method
(SSADM) with ConceptDraw PRO

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.

Structured Systems Analysis and Design Method solution

Payment Data Flow Diagram Example

Pic.1. Structured Systems Analysis and Design Method solution

The following features make ConceptDraw PRO the best Data Flow Diagram software:

  1. You don't need to be an artist to draw professional looking diagrams in a few minutes.
  2. Large quantity of ready-to-use vector objects makes your drawing diagrams quick and easy.
  3. Great number of predesigned templates and samples give you the good start for your own diagrams.
  4. ConceptDraw PRO 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.
  5. All ConceptDraw PRO 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.
  6. 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.
  7. If you have any questions, our free of charge support is always ready to come to your aid.

Related Solution:


Process Flowchart

When trying to figure out the nature of the problems occurring within a project, there are many ways to develop such understanding. One of the most common ways to document processes for further improvement is to draw a process flowchart, which depicts the activities of the process arranged in sequential order — this is business process management. ConceptDraw PRO is business process mapping software with impressive range of productivity features for business process management and classic project management. This business process management software is helpful for many purposes from different payment processes, or manufacturing processes to chemical processes. Business process mapping flowcharts helps clarify the actual workflow of different people engaged in the same process. This samples were made with ConceptDraw PRO — business process mapping software for flowcharting and used as classic visio alternative because its briefly named "visio for mac" and for windows, this sort of software named the business process management tools. This flowchart diagram shows a process flow of project management. The diagram that is presented here depicts the project life cycle that is basic for the most of project management methods. Breaking a project into phases allows to track it in the proper manner. Through separation on phases, the total workflow of a project is divided into some foreseeable components, thus making it easier to follow the project status. A project life cycle commonly includes: initiation, definition, design, development and implementation phases. Distinguished method to show parallel and interdependent processes, as well as project life cycle relationships. A flowchart diagram is often used as visual guide to project. For instance, it used by marketing project management software for visualizing stages of marketing activities or as project management workflow tools. Created with ConceptDraw PRO — business process mapping software which is flowcharting visio alternative or shortly its visio for mac, this sort of software platform often named the business process management process flowcharts, flowchart symbols, process flow diagram, workflow diagram, flowchart maker
Picture: Process Flowchart
Related Solution:

Cross-Functional Flowchart

There are many tools to manage a process or to illustrate an algorithm or a workflow. Flowcharting is one of those tools. However, it may be difficult to show complex processes that require multiple attributes or several people in a simple flowchart, so a cross-functional flowchart would be a solution for that situation. To create such flowchart, group processes and steps to labeled rows or columns, and divide those groups with horizontal or vertical parallel lines. It is worth mentioning that there are different types of cross-functional flowcharts, like opportunity or deployment flowchart. This diagram shows a cross-functional flowchart that was made for a trading process. It contains 14 processes, distributed through 5 lines depicting the participants who interact with the process. Also there are connectors that show the data flow of information between processes. The cross-functional flowchart displays a detailed model of the trading process, as well as all participants in the process and how they interact with each other. The lines in the flowchart indicates the position, department and role of the trading process participants.Cross-Functional Flowchart. flowchart maker
Picture: Cross-Functional Flowchart
Related Solution:

Data Flow Diagram Examples

Data flow diagrams are the graphical tool, used in the visualization of data flow of some data processing systems. It is the valuable process modeling tool. Also designing DFD is the important component of the initial part of any information system development project. The standard symbols are used to represent the interaction of a system components and how various kinds of components influence on data flow. The ConceptDraw Data Flow Diagrams solution is design to assist professional software engineers in making DFDs according to Gane and Sarson, and Yourdon and Coad notations. Do you imagine yourself as a successful IT specialist? To your mind, they all use data flow diagram examples to learn and to get inspired. Aren’t you still with us?Data Flow Diagram Examples
Picture: Data Flow Diagram Examples
Related Solution:

IDEF0 standard with ConceptDraw PRO

The activity of any organization is more or less branchy network of processes. The description of these processes is a hard technical task which requires definite methodology and standards. According to the IDEF0 standard any process can be described in the form of a block (Activity Box) which has inputs and outputs. The process consists in transformation of inputs into outputs under the influence of the management and in the presence of necessary resources. Outputs of the given process later on can be either inputs for the next process or resources, or management means.IDEF0 standard diagram example
Picture: IDEF0 standard with ConceptDraw PRO
Related Solution:

Data Flow Diagrams

Software development flourishes nowadays. Students have tons of educational information and courses that would fit every taste. And it's no secret that knowing how to draw data flow diagrams is a useful skill for a future software architect. The diagrams help a lot in understanding how to storage data effectively and how data processes within a system. This data flow diagram represents the model of small traditional production enterprise. It was created using Yourdon and Coad notation. The data flow diagram include four main objects: entity, process, data store and data flow. Yourdon and Coad notation uses circles to depict processes and parallel lines to represent data stores. Dataflows are shown as arrowed lines. They are labeled with the description of the data that move through them. Dataflow's role is to deliver the pieces of information. A process's function is to transform. the input data flow into output data flow. ConceptDraw Data Flow Diagrams solution contains the data flow diagram symbols of both Yourdon-Coad and Gane-Sarson notations and a set of handy templates to get started with DFD.Data Flow Diagram. UML Class Diagram
Picture: Data Flow Diagrams
Related Solution:

SSADM Diagram

The vector stencils library SSADM from the solution Systems engineering contains specific symbols of SSADM diagrams for ConceptDraw PRO diagramming and vector drawing software. The Systems engineering solution is contained in Software Development area of ConceptDraw Solution Park. The example below illustrates the waterfall model used in SSADM. This model involves 5 stages of developing a product such as requirements specification and its' analysis, design, coding and testing.SSADM systems development lifecycle
Picture: SSADM Diagram

Types of Flowcharts

A flowchart is a simple but very functional tool when it comes to understanding a workflow or to removing unnecessary stages from a process. When drawing flowcharts, keep in mind that there are four common types of flowcharts, like document flowcharts and data flowcharts that show control over a data or document flow over a system. To show controls on a physical level, use system flowcharts. In addition, to show controls in a program, you can draw a program flowchart. This flowchart diagram represents the piece of an article editing process, that involves the author and editor. It was created using the Basic Flowchart notation that consists from the basic flowchart symbols. The start and the end of the process are indicated with "Terminator" symbols. The "Process" symbols show the action steps consisting from making edits and searching for a compromise, when the author does not agree with the suggestions of the editor . The "Process" symbol is the general symbol in process flowcharts. The "Decision" symbol indicates a branching in the process flow. There are two branches indicated by a Decision shape in the current flowchart (Yes/No, Disagree/Agree). This basic flowchart can be used as a repeating unit in the workflow diagram describing the working process of some editorial office.Types of Flowcharts
Picture: Types of Flowcharts
Related Solution:

Program Evaluation and Review Technique (PERT) with ConceptDraw PRO

Big and complex projects sometimes need some simplification of plans and schedules. That's why Program Evaluation and Review Technique was invented and first implemented in 1958. You can create PERT diagrams effortlessly with ConceptDraw PRO and share them with your colleagues. Program Evaluation Review Technique (PERT) is a method that is used to assess and analyze projects. PERT is a valuable tool for the project management practice . PERT gives an assessment and analysis of the time needed to the project completion. A PERT chart is a visual tool that delivers a graphical view of a project timeline. It is used to display the sequences and dependences of project tasks necessary to complete a project. ConceptDraw PRO delivers the possibility to build a PERT along with other diagrams applied to assist management process by using its Seven Management and Planning Tools solution.PERT chart - Request for proposal (RFP)
Picture: Program Evaluation and Review Technique (PERT) with ConceptDraw PRO
Related Solution:

Gane Sarson Diagram

Describing the way data flows through an information system might become a subject of a study. One of the kinds on a data flow diagram is called Gane Sarson Diagram after its authors, and it slightly differs from other notations. Process symbols in this notation are depicted as rounded rectangles connected with arrows representing data flows. This is a sample of data flow diagram. It demonstrates utilization of the Gane-Sarson notation for making DFD on the example of an online appointment system of the Health Centre. This sample is used the vector objects library of Gane-Sarson DFD notation supplied by the ConceptDraw solution for data flow diagramming. It contains all symbols of the Gane-Sarson notation including connectors, jumps, and processes. This solution can be successfully utilized to generate DFDs for business documentation, and presentations.Gane Sarson Diagram
Picture: Gane Sarson Diagram

Campus Area Networks (CAN). Computer and Network Examples

If we divide computer networks by scale, we get several main categories. The smallest network is PAN, as it connects personal devices themselves, and as the number of users grows, a local area network can be recognized, and campus area networks (CAN) connects several local networks located within some area like a university or a corporation. Computers connected to CAN share public educational materials and list of CAN network examples includes such prestigious universities like Stanford and Carnegie Mellon. This is an example of a computer network diagram created for a campus area network. It was created using using ConceptDraw solution for the Computer and Network diagramming. The specific of this sample campus network is its distribution. It is rather broad to embrace a big campus territory. This diagram can be applied as a template for designing custom area network topology diagram for a particular educational institution.Campus Area Network
Picture: Campus Area Networks (CAN). Computer and Network Examples
Related Solution:
1 Diagram Software
Professional business graphics tool for drawing schemes, diagrams and illustrating business documentation
1 Mind Map Software
Excellent tool for Mind Mapping, Planning, Brainstorming, and Building Processes
1 Project Management Software
The full complement of features needed to successfully plan and execute projects, including task and resource management, reporting, and change control