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Part 43:What is agile methodology? Disadvantage of waterfall model in software development.

Introduction 
          In this article we will learn about waterfall model and why we need to use agile methodology in software development company.
Once you go to develop any product then software development process is divided into multiple phases in the Waterfall model while Agile methodology divide the project,software development life cycle(SDLC) into multiple sprints. ... One of the main differences between Agile and Waterfall development methodology is their individual approach towards application quality,accurcy and application testing.

Agenda: 
  • What is SDLC(Software development life cycle) ?
  • What is waterfall model?
  • Draw back of waterfall model.
  • What is Agile methodology?
  • What is scrum in agile?
  • Roles of Scrum.
  • Top 10 reason to use Agile methodology in software development .
Software development life cycle (SDLC):
     SDLC is the acronym of Software Development Life Cycle. It is likewise called as Software development process. The product development life cycle (SDLC) is a system characterizing undertakings performed at every progression in the product development process. ISO/IEC 12207 is a worldwide standard for programming life-cycle forms.

According this we can understand easily this one is just only some step to develop any type project. 

Waterfall Model: 
      The waterfall model is a step by step process or sequential (non-iterative) design pattern, which is used in software development company, in which process is seen as going steadily downwards (like a steep fall or waterfall) through the stage of conception, planning, analysis, design, development, testing, production/implementation and maintenance. 

 According this image we can understand what is the flow of software development process,
there are many draw back in waterfall model,so i am going to explain in given below lines.

Drawback of waterfall model: 
    Disadvantages of waterfall model,once any application is moving in testing phase, it is very tough to go back and apply change something that was not well-planned out in the planning phase. No any working software is produced until late during the life cycle process. Huge amounts of risk and uncertainty. I have faced some new issue in waterfall model which are listed below.
1.   Unclear Requirements
2.   Requirements changes
3.   lack of involvement of the customers
4.   Accuracy of estimation
5.   Uneven loading of the resources
6.   Last minute correction difficult
7.   Not much time for testing
8.   No time to fix test defects
9.   Lot of documention
10.                Schedule and cost overruns
11.                Lot of mid night oils before final delivery
12.                customers not happy  
To avoid the drawback from waterfall model now days most of developers are using agile methodology in software development.
Now i am going to explain in details why chose agile in place of waterfall model.go in next lines below.

What is agile methodology?
 "Agile software Development" is an umbrella term for a few iterative and incremental programming development approachs. The most famous agile methodology incorporate Extreme Programming (XP), Scrum, Crystal, Dynamic Systems Development Method (DSDM), Lean Development, and Feature-Driven Development (FDD). 


According this image we can understand agile divide software development process in multiple sprint,I means each sprint is a completing software development life cycle. 
    Sprint: In the Scrum technique for Agile programming development, work is limited to a standard, repeatable work cycle, known as a sprint or emphasis. Scrum sprints used to be 30 days in length, yet today we exhort one-week or two-week sprints.we can say sprint is group of task ,collection of task.

What is scrum in agile ? 
    Scrum is a agile approach to manage a project, more often than not project development. Coordinated project development with Scrum is regularly seen as a strategy; but instead than survey Scrum as procedure, consider it a system for dealing with a procedure. 
  
Roles of Scrum: 
          There are three specific roles in scrum:
Product Owner:
          Product Owner should be a person who can work with vision, authority, and availability. The Product Owner is always responsible for continuously intract the vision,priorities,anythings for the development team.
It’s sometimes difficult for any Product Owners to strike the right balance of involvement in project. Because of Scrum values self-organization among with teams, A Product Owner should be fight the urge to micro-manage. At the same time, Product Owners must be always available to answer questions from the any  team member.

Scrum master:
        The Scrum Master goes about as a facilitator for the Product Owner and the team. The Scrum Master does not deal with the team. The Scrum Master attempts to expel any obstacles that are hindering the team from accomplishing its sprint objectives. This helps the team stay imaginative and beneficial while ensuring its victories are obvious to the Product Owner. The Scrum Master likewise attempts to prompt the Product Owner about how to amplify ROI for the team. 

Team: As per as Scrum’s founder, “the team is utterly self managing.” they can be developer,tester,ui-designer.
The team is always responsible for find how it will accomplish the work to be completed on time. The team has autonomy and responsibility to meet the objectives from  sprint. 

Top 10 reason to use Agile methodology in software development:
1.   Ambiguous requirements
2.   Requirement changes are inevitable
3.   Big,Upfront Planning is not practical
4.   Reviewing the working software is better
5.   Iterative and incremental development  
6.   Delivery through small baby steps
7.   Frequent reflections by  the projects teams
8.   Reducing the chances of risk.
9.   Visibility with customers
10.                Flexibility in work
I hope you have learn lot of things about agile methodology and drawback of waterfall model.For more details you click on given link.
For video session:




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Author: Bikesh Srivastava - Monday, 16 January 2017

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