Design Phase

Introduction of Design Document

In software development project design document is one of the basic and most import thing because it tell us that what our end product is going to look like in this phase of project many thing about are project is revealed and this document tell the user that how our program is going to work what are the basic thing from which our product is made of or in other word it is the blue print of our project that what can our program can or cannot do ,what are its limits and what action it can perform and what are the benefits of using this program. Designing software is one of the main goals which one should have close eye on because if your design is good the end product will also going to be a great one. Designing software is progress by large number of iteration in this phase the software developer analysis the system and calculates all the aspects of the system.

In this process there are many numbers of different models that shows us the different aspects of our system .we judge our system by applying different kind of techniques to check the level of concepts in our system. These models that are used throughout requirement engineering domain models are the go together.

At this level the design of the software architecture is shown by the separating the system into different subsystem or models and their interferences with each other.

Data modeling is also an essential activity performed during the design phase. This includes the identification of data entities and their attributes, relationships among these entities, and the appropriate data structures for running this data.

In design phase we determine the functional and non functional requirement of our project. We also determine the business purposes with respect to software development .Design phase explain the activities and tasks which are necessary during the completion of our project.

 Following are the things which are included in this phase

·        Entity Relationship Diagram (ERD)

·        Sequence Diagrams

·        Architecture Design Diagram

·        Class Diagram

·        Database Design

·        Interface Design

·        Test Cases

Entity Relationship Diagram (ERD)

Entity-relationship (ER) diagram is a graphical representation of entities and their relationships to each other. An entity is a piece of data-an object or concept about which data is stored. A relationship is how the data is shared between entities.

There are three types of relationships between entities:

·        One to One

·        One to many

·        Many to many 

 

One to one

In this relation a single entity has one relation

 

One-to-Many

In this relation a single entity has many relation

Many-to-Many

In this relation many entity has many relation with each other.

Sequence Diagrams

A sequence diagram is a kind of interaction diagram that shows how processes operate with one another and in what order. It is a construct of a Message Sequence Chart. A sequence diagram shows object interactions arranged in time sequence. Sequence diagrams are typically associated with use case realizations in the Logical View of the system under development. Sequence diagrams are sometimes called event diagrams or event scenarios.

Architecture Design Diagram

An architectural model is a rich and rigorous diagram which is created using available standards in which the primary concern is to illustrate a specific set of tradeoffs inherent in the structure and design of a system or ecosystem. An architectural model is an expression of a viewpoint in software architecture.

Class Diagram

A class diagram in the Unified Modeling Language (UML) is a type of static structure diagram that describes the structure of a system by showing the system's classes and their attributes, operations and the relationships among objects.

Database Design

Database design is the process of producing a detailed data model of a database. This logical data model contains all the needed logical and physical design choices and physical storage parameters needed to generate a design in a Data Definition Language. This can then be used to create a database.

Interface Design

Interface design deals with the process of developing a method for two or more modules in a system to connect and communicate. These modules can apply to hardware, software or the interface between a user and a machine.

Test Cases

A test case is a set of conditions or variables under which a tester will determine whether an application software system or one of its features is working as it was originally established for it to do.