Agile methodology vs Waterfall model
Agile methodology vs Waterfall model
In this article, we determine the main features of two well-known projectmanagement methodologies and the difference between Agile and Waterfallmodels. It should be easy to define strengths and weaknesses of each methodusing friendly project scheduling software with Gantt charts.If you have only a general and superficial opinion about these methodologies,you can find out all the details, studying the main advantages of Agileproject management methodology and the features of Waterfall methodology.If recall briefly:Waterfall project methodology is a model in which every stage of a product’slife cycle takes place in sequence. The progress flows steadily downwardsthrough these phases like a waterfall.Agile software development methodology is the model that proposes asequential, linear and iterative approach.
What is the agile software development life cycle (SDLC)?
Let’s begin with the software development life cycle before moving onto itsagile form. Software development life cycle or SDLC is the approach ormethodology followed to design, develop, and test software. The main objectiveof any SDLC is to deliver high-quality software products within pre-definedcost and time restrictions. Now let us see how agile software development lifecycle is different.Agile software development life cycle combines both incremental and iterativeapproaches for developing software. The primary focus areas of agile SDLCinclude customer satisfaction and process adaptability. It ensures that bothof these are taken care of by rapid delivery of the required product. AgileSDLC involves the process of product development into incremental builds.These builds undergo constant iterations to ensure lower time consumption anda quality product.Teamwork is an essential component of agile software development life cycle.Different teams work collaboratively and make necessary amendments at variousstages to achieve the ultimate objective of the project. What are thedifferent phases of agile SDLC? Let us see.
Phases of agile SDLC
The most important purpose that the agile SDLC serves is adding structure tothe method used for delivering a working product and to make it more flexibleand fluid. When you divide the builds into smaller segments, you are incomplete control of the product development process. You are in a betterposition to deliver a product that has much more value to provide itscustomers. Here are the different phases of agile software development lifecycle: * Requirements gathering: So before you start designing the project or ask an agile development consulting firm to do it on your behalf, you need first to put together a list of all the essential requirements of your project. Some of these requirements may include the result that you want the project to achieve, the features that it will have and support, and more. It is always advisable to not put too many requirements in this initial list. Just add the features that are necessary and ignore those that can be done without. These features can be discussed when the product is deployed and its primary features are working as they were supposed to. * Design: When you have a clear idea of the project, you will be working on, sit down with the stakeholders to discuss and define its essential details. You can either use the UML diagram or the flow diagram to display the new features and to show how the new product will integrate with the existing system. Further iterations in the design phase are done to refine the earlier design so that it is compatible with the new features. * Development/construction: This phase involves bringing the initial requirements documentation to reality. The writing of the code happens in this phase. No wonder this phase is the longest out of all the other stages. It is also the spine of the entire agile software development life cycle. The product undergoes several improvements to ensure that simple functionality. * Integration and testing: The primary objective of this phase is to ensure that the product doesn’t have any bugs and that it supports whatever the developers have written earlier. Tests are conducted to check the code and to ensure that the solution is in line with the business objectives. * Implementation and deployment: The software is deployed and is made available to the people it was made for. Further iterations provide updates for getting rid of bugs and bringing in new features. * Feedback/review: This is the last phase of the agile SDLC. The team works on the feedback that it has received after the product was made available for use.Agile SDLC uses incremental and iterative approaches to implement planning andmanagement techniques for the development of software products based onspecific project requirements.SDLC – Agile Model
Waterfall And Agile Model Workflows
In simple English, Agile means ‘able to move quickly and easily’ and hencethat is what it means when it comes to the Agile development methodology.Agile is a method of project management that is represented by splitting thetasks into shorter segments of work with frequent reviews and adaptation ofplans.Similarly, the word waterfall denotes a vertical flow of water or the flow ofwater through a series of steep drops. The waterfall model is a linearsequential model in which the progress flows majorly in one directiondownwards through the phases of requirement gathering, analysis, design,development, testing, deployment, and maintenance.This same illustration applies to the concept of project management when itcomes to the waterfall model. It is a method of project management that isrepresented by serial stages and a fixed plan of work.[image source]Before discussing the Waterfall workflow and Agile workflow, let us have alook into the Software Development Life Cycle definition and its requirements.
1) Waterfall Model
As discussed earlier, the waterfall model is the first introduced softwaredevelopment life cycle. It is the sequential way of developing software. Veryfew companies follow this approach. When the project is very simple and thereare no further requirements changes, we will follow this approach.We will discuss more on the waterfall model in this tutorial.
In the Waterfall model, each phase should be completed before starting anotherphase. We cannot operate multiple phases at the same time. This was introducedin 1970 by Winston Royce. The Waterfall model is divided into differentphases.[image source]Waterfall Model includes the following phases: 1. Requirement collection 2. Feasibility study 3. Design 4. Coding 5. Testing 6. Maintenance
Now we will see the Agile Software development life cycle. Agile is theprocess of doing work quickly and easily with more accuracy.This model is related to a method of project management, used especially forsoftware development. It is characterized by the division of tasks into shortphases of work and frequent reassessment and adaptation of plans. Each teammember should have the idea of the basic business flows.[image source]In Agile, developers and testers work parallelly to develop and test theapplication software. Development is done in iterative mode. Each iterationuser stories requires the analysis, design, coding, and testing.We test the requirement in a detailed manner to verify if the requirement iserror-free and implementable or not. Switch to next iteration after the end ofeach iteration and we follow the same process to the new/other requirements.Thus, this process of developing and testing the block of software isperformed in a short duration of time with more accuracy and flexibility. Somore industries follow and adopt this process.First, the product owner will add all requirements to the product backlog. Theproduct backlog contains all the user stories. Let us say, 100 to 150 userstories are related to the complete project. Now add the particular userstories to the sprint backlog which we need to be implemented. Then, all thedevelopers, QA, BA will work on the sprint items. This is how Agile flowworks.
Software Development Life Cycle: Why Go Agile
There’s no doubt about it: agile is a powerful and efficient method forsoftware development. It does not simply offer benefits to the developmentteam but also has business advantages to the client.With the agile software development life cycle model, teams can easily handlemany of the typical project pitfalls involving costs, scope, and conflictingschedules in a more controlled way.By organizing and reinventing activities related to custom softwaredevelopment, agile achieves its many objectives in a leaner, more efficient,and more business-focused manner.Factors to Choose the Right Agile Development MethodAgile software development has become popular in recent years as the projectsuccess rate using the agile development model is better than structuredwaterfall methods. However, the survey record shows that 50 percent ofprojects which implemented agile software development, failed due to wrongselection of agile methodologies.Moreover, selecting the most appropriate agile methodology for agile softwaredevelopment is a challenging task. Additionally, migrating to an agile methodcarries an inherent risk with it. But what are those factors of agile softwaredevelopment that drive the selection criteria of appropriate agilemethodologies for projects?Let’s look into the agile methodology overview considering its factors throughthis blog.
Popular agile methodologies used in agile software development
There are many agile methodologies practiced in project management like * Extreme Programming (XP) * SCRUM * Test-Driven Development (TDD) * Feature-Driven Development (FDD) * Lean Development (LD) * Adaptive Software Development (ASD) * Agile Modelling (AM) * Crystal Family Group (Clear, Red, Orange, Yellow) * Internet Speed Development (ISD) * Disciplined Agile Delivery (DAD) * Agile Software Process Development * DevOps * Kanban * Dynamic Systems Development Method (DSDM).> Must Read: Top 25 Agile Interview Questions with Detailed AnswersAgile development model contains its own pros and cons based on the agilemethodology selected for the project. However, in any agile softwaredevelopment, it follows iteration which ensures continuous delivery.Let’s look at some of the popular agile methodologies and their overview:Brainstormed by 17 software programming professionals in February of 2001, theagile manifesto was developed for effectively build software. The manifesto isnothing but the agreed thoughts of the leaders which focuses on four values: * Individuals and interactions over processes and tools * Working software over comprehensive documentation * Customer collaboration over contract negotiation * Responding to change over following a planAlong with that agile software development which is supposed to implementagile manifesto must follow twelve manifesto principles and these are: 1. Customer satisfaction through early and continuous software delivery 2. Accommodating changing requirements throughout the development process 3. Frequent delivery of working software components 4. Collaboration between the stakeholders and developers throughout the project 5. Motivate, support and trust the people involved in the project 6. Enable face-to-face interactions 7. Considering working software as the primary measure of progress 8. Agile processes for supporting a consistent development pace 9. Attention towards technical design and detail to enhance the agility 10. Simplicity 11. Self-organizing and motivated teams encourage great requirements, architectures, and designs 12. Focus on how to become more effective on a regular basis.> Also Read: How to build a career in Agile?Extreme Programming follows an agile software development model thatemphasizes on a high level of involvement between the development team and thecustomer. The customer makes the user stories and prioritizes them for thedevelopment. Then the development team follows the continuous iterative modelto deliver the user stories. Each iteration involves planning, programming,testing, and continuous collaboration. Furthermore, each iteration cycletypically takes 1 to 3 weeks.This is an aggressive agile development model that ensures fast delivery.However, it is among highly disciplined agile methodologies which needextremely skilled project associates.This is the mostly used agile methodologies in agile software development. Inthis method, the product owner prioritizes the iterative work based on system-wide functionality which is known as “product backlog.” In SCRUM, theiteration is known as a sprint, and it generally lasts up to 30 days.In this agile development model, the scope creep is well controlled becauseonce the sprint is committed and further development functionality is notentertained in that sprint. After every sprint the product backlog is analyzedand, they are reprioritized for the next cycle.> Try Now: Professional Scrum Master PSM I Free Exam Simulator
The SDLC Agile Model
Let’s now answer the bugging question:What does a software development lifecycle in the Agile framework look like?Short answer: the development process and the model stays the same.However, the execution becomes iterative and incremental, following the Agilepractices, as mentioned in the Agile manifesto.What does that mean? * Iterative: the cycle is repeated until you get the desired result * Incremental: every cycle has something more advanced to offer (the increment)The Agile SDLC model is executed and repeated at every iteration (generally,the entire software development lifecycle lasts for only about a month) untilyou get the final product.Remember, in Agile software development, the stakeholder comes in at the endof each iteration and gives their feedback. This is then incorporated in therequirement analysis stage of the next software development iteration.So here’s how the SDLC stages change in the Agile SDLC model: * Requirement analysis: incorporates the suggestions received at the end of the previous iteration * Design: the feedback is kept in mind while designing the upcoming increment * Coding and developing: the developers work to build the increment (which includes only some features) rather than building the entire software in one go * Testing: the testers design and execute test plans according to the increment * Deployment: the operation team deploys the newly developed version * Maintenance: the new software version is monitored by the operation team to ensure things are working smoothly before starting on the next iterationNote that in the Agile software development lifecycle, after the deployment,the customer interaction and feedback is necessary before starting the nextcycle.Still not completely clear about the differences between the Agile developmentmodel and the traditional SDLC model?Don’t worry. We have more in store for you!
How To Manage Agile Software Development Cycle Effectively
Managing a project can be challenging, especially when it’s something like afast-changing Agile SDLC.I mean, you have targets, team roles, goals, and a lot of fast-moving parts.Luckily, you don’t have to be a lightning-quick superhero to manage SDLCAgile.All you need is a powerful software like ClickUp, which makes managing theAgile lifecycle a walk in the park.Wait, what’s ClickUp?ClickUp is the world’s highest-rated Agile project management software.Used by 100,000+ teams in companies from startups to titans like Google, Nike,Airbnb, and Netflix, it can help you manage Agile or any other SDLC model.Whether you need help with: * Any methodology like Kanban, Agile Scrum, or Extreme Programming * Managing your product backlog or sprint backlog * Keeping track of your testing processes like bug testing or security testing * Any planning process, like sprint planning or resource planningClickUp has got you covered!Sounds great?Let’s take a look at how ClickUp can help you through the entire softwaredevelopment process:Goals are super important for every project.Without it, your project will be like a lost ship in the middle of the ocean.Just before starting the first iteration of the software lifecycle, you’llneed to set both long term and short term goals for your Agile project.Here’s what goals look like in the Agile methodology: * Optimize landing page design for maximum customer interaction * Add a timer feature to the landing page * Add a popup feature when the user goes to exit the webpageUsually, at every requirement analysis stage, you often get multiple goals totake care of.But how do you keep track of every goal?Keeping track of everything on a piece of paper is certainly not a good optionin 2020.Who knows what can happen to that sheet of paper?!Luckily, ClickUp’s Goals feature can help you out!Goals are high-level containers that can be broken down into smaller Targets,which can be easier to achieve. While this keeps everything organized, it alsomotivates your Agile or Scrum team by giving them a frequent feeling ofaccomplishment.Additionally, with every completed Target, ClickUp auto-updates your team’sprogress percentage in real-time. This way, everyone has a clear picture ofhow close they are to achieving the goal.Using ClickUp’s Goals, you can also: * Quantify your Agile Goals with OKRs (Objectives and Key Results) * Create weekly scorecards for better performance appraisal * Track Scrum sprints or any project in real-time
The Waterfall Model
The Waterfall methodology is the most popular version of the SystemDevelopment Life Cycle for software engineering and any project involving theInformation Technology field. This methodology is known to follow a sequentialand linear process. Sometimes, the planning of the waterfall methodology isdone with the help of a Gantt chart. This type of bar chart shows the startand end dates for each task. They generally consist of eight stages, and onceone of the eight stages is complete, the development team moves into the nextstep. In the waterfall methodology, the team cannot go back to a previousstage without starting the whole process from the beginning. The team alsoneeds approval and feedback on the requirements of the customer to move to thenext step.Peter Kemp / Paul Smith / CC BY