Entity- Relationship Diagram and its Importance

Entity- Relationship Diagram and its ImportanceData flow diagrams show how, where, and when data are used or changed in the information system, but they do not show the definition, structure, and relationships within the data.An Entity can be any object, place, person or class. In E-R Diagram, an entity is represented using rectangles. Consider an example of an Organisation- Employee, Manager, Department, Product, and many more can be taken as entities in an Organisation. E-R model is used to represent real-life scenarios as...

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Program Evaluation Review Technique and its Importance

Program Evaluation Review Technique (PERT)It is a project management tool that provides a graphical representation of a project's timeline. PERT breaks down the individual tasks of a project for analysis.  PERT was developed primarily to simplify the planning and scheduling of large and complex projects in 1957.PERT analyzes the time required to complete each task and its associated dependencies to determine the minimum time to complete a project.Purpose of PERT ChartsProject managers can use PERT charts to: Set a realistic timetable...

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Data Flow Diagram and its Importance

Data Flow Diagram and its importanceProcess modeling involves graphically representing the processes or actions, that capture, manipulate, store and distribute data between a system and its environment and among component within the system. A common form of a process model is a data-flow diagram (DFD).  A process model is a formal way of representing how a business system operates. Through structural analysis technique called data flow diagram, the system analyst can put together a graphical representation of data processes throughout the...

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Software Engineering: Classification of Requirements

Software Engineering: Classification of RequirementsRequirement can be classified as:Functional requirementsNon-functional requirementsUser requirementsSystem requirementsWhat is a Functional Requirement?In software engineering, a functional requirement defines a system or its component. It describes the functions a software must perform. A Functional Requirement is a description of the service that the software must offer. It describes a software system or its component.  For example, in a hospital management...

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Software Engineering : COCOMO (Construction Code Model)

COCO Model  OR COCOMO (Construction Code Model)The COCOMO is one of the most popularly used software cost estimation models i.e. total project cost and scheduled time for the project based on the size of the software product.T his model depends on the number of lines of code for software product development. It was developed by a software engineer Barry Boehm in 1981.According to COCOMO, there are three modes of software development projects that depend on complexity.Basic Project: It is the one type of static model to estimates...

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