Yourdon and Coad Diagram

OOAD is simply an abbreviation for the term of “object-oriented analysis and design”, which is a very popular technical approach used for designing and analyzing any needed application, business or system in a way of applying the object-oriented programming. The mentioned approach involves the visual modelling throughout the life cycles development to foster better product quality and stakeholder communication.

OOAD in the modern software engineering is known to be best conducted in both incremental and iterative ways. The outputs of the OOAD activities, the analysis models for OOA as well as the design models for OOD are refined. Each software life cycle is usually divided up into at least a few stages: from abstract descriptions of the problem to designs to code as well as process of testing all the way to the deployment stage. The earliest stages of such process are analysis and design. The analysis phase is also known to be called as the "requirements acquisition".

In some approaches to the software development, such as the so-called “waterfall models”, the boundaries between each of the stages are meant to be sequential and rigid. The term "waterfall" itself is known to be coined for such methodologies in order to signify that the progress goes in one direction only. For example, once analysis is complete then its design can begin and it is not a usual thing for such situation to happen when a design issue requires a change in the analysis model or when, for instance, a coding issue requires some changes in design.

The alternative to the described “waterfall models” are the “iterative models”. The mentioned distinction was popularized by Barry Boehm while he was working on his Spiral Model trying to develop the software. In case of the “iterative models”, it is always possible to do work in a few different stages of the model in parallel. Thus, for example, it is always possible and acceptable to work on design, analysis and code on the same day having issues from one stage impact issues to another one. The software development is known to be a knowledge-intensive process and the things such as analysis cannot be realized without understanding the design issues as well as the coding issues affecting design.

The object-oriented model focuses on the re-usability as well as on modularity. The main goal of the object-oriented approach is to please the so-called "open-closed principle". A module is known to be “open” in case it supports extension. In case the module provides the standardized ways to add the new behaviours or to describe the new states. In the object-oriented paradigm it is often accomplished in a way of creating a new subclass of the existing class. Any module is known to be closed in case it has a well-defined stable interface that all of the other modules have to use and that limits the interaction as well as the potential errors that can be introduced into only one module by the changes in another.

Any software life cycle is known to be divided up into a few stages going from the abstract descriptions of the problem to design then to code, later — to the testing stage and later, finally, to the stage of deployment. The early stages of this process are stage of design and stage of analysis. There is a distinction between design and analysis which can sometimes be described as "how vs. what". In the analysis the developers are known to be working with the users as well as the domain experts try to define what system is supposed to do. The implementation details are expected to be totally or mostly ignored at this stage depending on the method itself.

The major difference between the object-oriented analysis and any other form of analysis is that by the object-oriented approach we can organize the requirements around objects, that integrate both data (states) and processes (behaviours), which were modelled after the real world objects which some particular system interacts with. In the so-called “traditional analysis methodologies”, the processes and data (the states and behaviours) are considered separately from each other. You can always visualize your data modelled by the Entity-Relationship diagram, for example, and the behaviours in the way of the flow or structure charts. To make any of the mentioned illustration you can always use ConceptDraw DIAGRAM v12 diagramming and drawing software as well as any needed solution downloaded from another product of CS Odessa — ConceptDraw STORE.

Data Flow Diagram (DFD) Solution

Example 1. Data Flow Diagram (DFD) Solution in ConceptDraw STORE

The primary tasks in the OOA (object-oriented analysis) are to find the objects, to organize these objects, to describe the way how the objects interact with each other, to define the behaviour of the mentioned objects and so to define the internals of such objects. The common models which are used within OOA are object models and use cases. The object models are known to be those which are used for describing the class relations, such as a circle to be a subclass of a shape, for example, operations, properties and names of the major objects. The user-interface prototypes or mock-ups can also be created in order to help simplify the understanding. The use cases are known to be describing the scenarios for the standard domain functions which the system is expected to accomplish.

Yourdon and Coad diagram - order process

Example 2. Yourdon and Coad diagram — Order Process

Being involved in the OOA as well as OOAD you might find it very useful to have an OOAD solution downloaded from the ConceptDraw STORE application to use while working in ConceptDraw DIAGRAM v12 software creating any needed diagrams. Having all the needed tools can simplify your work with making the diagrams, such as the Yourdon and Coad ones. Peter Coad and Edward Yourdon developed the so-called “Coad/Yourdon method” used for the OOA. Object-oriented analysis and design (OOAD) is a popular technical approach for analyzing an application, designing the system or business in a way of applying the object-oriented paradigm. Being involved in such activity you may find ConceptDraw DIAGRAM v12 a very useful professional tool for making any needed OOA diagrams.






TEN RELATED HOW TO's:

ConceptDraw DIAGRAM v12 ER Diagram Tool

Database design is an important part of any project, as databases become more and more complex nowadays. To make the model more representative, entity relationship diagrams are widely used in software engineering area. These diagrams show sets of entities as rectangles connected via lines labeled with their cardinalities. This an example of the ER-diagram developed to store information regarding some online role-playing game. It includes three main elements of ER diagram: entities, relationships and attributes. The entities, attributes and relationships on this ER-diagram is depicted according to the Chen's notation. Chen's notation for Entity Relationship diagrams admits using of rectangles to depict entities, ovals for attributes and ,at least, diamonds to show relationships . ConceptDraw Entity-Relationship Diagrams solution was applied as ERD software to create this diagram.ER Diagram Tool. Chen ERD
Picture: ConceptDraw DIAGRAM v12 ER Diagram Tool
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Data Flow Diagram Symbols. DFD Library

Any information system receives data flows from external sources. In order to visualize them there is a list of data flow diagram symbols that describes how the system components cooperate. If you want to create a data flow diagram, ConceptDraw DIAGRAM v12 Solution Park has DFD Library that contains both Yourdon and Gane-Sarson notations. This figure shows the content of vector libraries, delivered with ConceptDraw solution for data flow diagram (DFD). There are three libraries composed from about 50 vector objects used to make data flow diagrams. They include a complete set of objects utilized by Yourdon-Coad and Gane-Sarson notations - two primary notations that are apply for data flow diagramming. Also, one can discover additional "Data flow diagram (DFD)" library that provides a data flow diagram elements for designing level 1 and context-level data flow diagrams.Data Flow Diagram Symbols. DFD Library
Picture: Data Flow Diagram Symbols. DFD Library
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Jacobson Use Cases Diagram

The vector stencils library UML Use Case contains specific symbols of the UML notation such as actors, actions, associations and relationships for the ConceptDraw DIAGRAM v12 diagramming and vector drawing software. This library is contained in the Rapid UML solution from Software Development area of ConceptDraw Solution Park.Jacobson Use Cases Diagram - Restaurant System
Picture: Jacobson Use Cases Diagram
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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 DIAGRAM v12 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 DIAGRAM v12 — 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 DIAGRAM v12 — 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 tools.business process flowcharts, flowchart symbols, process flow diagram, workflow diagram, flowchart maker
Picture: Process Flowchart
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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
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Booch OOD Diagram

The vector stencils library Booch OOD from the solution Software Engineering contains specific symbols of the Booch method such as class symbols, association symbols, aggregation symbols for ConceptDraw DIAGRAM v12 diagramming and vector drawing software. The Software Engineering solution is contained in the Software Development area of ConceptDraw Solution Park.Booch OOD Diagram
Picture: Booch OOD Diagram

Example of DFD for Online Store (Data Flow Diagram)DFD Example

Structured-systems analysis and design method uses data flow diagrams to represent the process of data flowing through a system. Talking about this might be useless without a proper example of DFD for online store (Data Flow Diagram). This DFD example shows all the distinctness that a diagram can bring into a scattered data structure. Data flow diagrams are used to show how data is processed within some business processes. Making DFD is a common practice for business process modeling and analysis. This diagram represents the online store business flow. It describes inputs and outputs within online selling process and depicts the interactions between its participants. This DF diagram can be used by system analysts to create an overview of a business, to study and discover its inherent strengths and weak points.Online Store Data Flow Diagram
Picture: Example of DFD for Online Store (Data Flow Diagram)DFD Example
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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

Entity Relationship Diagram Examples

An abstract representation is usually the first thing you will need while developing a database. To understand the ways that databases are structured, you should look through entity-relationship diagram examples and see the notations features and attributes. With an entity-relationship model you can describe a database of any complexity. This Entity-relationship diagram is a tool for software developers. It enables every element of database to be managed, communicated and tested before release. This ERD was created using symbols advocated by Chen's notation. Because of a linguistic origin of the Chen’s notation, the boxes representing entities could be interpreted as nouns, and the relationships between them are in verb form, shown on a diagram as a diamond.Entity Relationship Diagram Examples
Picture: Entity Relationship Diagram Examples
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Design Data Flow. DFD Library

A model of a system is defined as a set of hierarchical diagrams representing the asynchronous process of data transformation from the moment it is input to the system to the moment it is output to the user. To demonstrate how a process transforms the initial data, you should design a data flow diagram using a DFD Library included in ConceptDraw DIAGRAM v12 Solution Park. Start your diagramming experience now! You can use this library of symbols related to data flow diagrams (DFD) to design data-oriented or process-oriented models along with data process diagrams. This vector objects library It is a part of ConceptDraw solution designed for data flow diagramming, along with corresponding samples and templates. A data flow diagram is a 2D flowchart that depicts the sequence of particular activities and operations operations and activities which is accompanied by the dynamic flow of some data.Design Data Flow. DFD Library
Picture: Design Data Flow. DFD Library
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