what is a downside of using the traditional waterfall approach?

As an alternative, Agile is better suited for teams who want to move quickly, experiment with direction, and start without knowing exactly how the project will turn out. Therefore, the project team will be responsible for fixing those errors and. Webadvantages and disadvantages of stenhouse process model. The waterfall approach assumes that you can nail down all requirements upfront, which is often unrealistic. Waterfall is ideal for projects like software development, where the end result is clearly established before starting, and is best suited for projects that require a lot of predictability. The phases of the waterfall methodology are straightforward, meaning that theyre easy to follow by all team members without requiring any previous training. But stakeholder needs can change frequently, right? To start coding, you need to complete the, only then will you know what programming language and software architecture you need in the, Youll develop a product/system that doesnt meet Ross. Do Not Sell or Share My Personal Information, Agile, DevOps and software development methodologies. Because of this, the client tends to end up with a product that doesnt meet their needs if they have been unwilling to change their mind or they were unrealistic in expecting things not to change during the course of a project. The waterfall model continues to be used in industrial design applications. By doing this, project managers can efficiently plan the other phases of the project and, Based on the requirements outlined in the previous step, the project manager needs to come up with a. for the end product that includes concrete specifications. enables large or changing teams to move toward a common goal that's been defined in the requirements stage; forces structured, disciplined organization; simplifies understanding, following and arranging tasks; facilitates departmentalization and managerial control based on the schedule or deadlines; enables early system design and specification changes to be easily done; and. It can increase costs and delays if updates are incorporated in What are the main advantages and disadvantages of the waterfall method? Agile methodologies are renowned for their flexibility. There are several important variables within the Amazon EKS pricing model. Information provided on Forbes Advisor is for educational purposes only. Agile is a technique that encourages ongoing testing and development throughout the projects software development lifecycle. Poor model for complex and object-oriented projects. Here are 11 reasons why WebAssembly has the Has there ever been a better time to be a Java programmer? It sets distinct endpoints or goals for each phase of development. Each stage needs to be completed and validated before moving on to the next phase. Since the Waterfall Model is applied sequentially, the project development team can proceed to the following stage of development or testing only when the previous stage has been successfully completed. They can no longer afford to be bound by lengthy IT initiatives that, once started, cannot be amended or adjusted. On the other hand, the flexibility of the agile method can help with aspects of the implementation phase, including handling changes, incorporating client feedback into the process, and speeding up project delivery. Waterfall doesn't let processes overlap for simultaneous work on different phases, reducing overall efficiency. Some important capabilities to have in project management software are the following: Besides Agile software development methods, alternatives to the waterfall process include the following: Software development teams today often use Agile and DevOps methodologies instead of the waterfall method. At the end of each sprint, stakeholders review the deliverable and give their feedback. See All Rights Reserved, Get more stuff done without losing sleep. Disadvantages of the waterfall model typically center around the risk associated with a lack of revision and flexibility. The Waterfall approach was established in 1970 by Winston w. Royce. time, and cost of delivering the final product. Coming up with specific details might be difficult for clients, and without these, the project manager cant proceed to the next phase. Firstly, you dont have to learn any principles to use the Waterfall model. How does an agile team maintain requirements? Instead, it follows an iterative and incremental process. In the waterfall method, each step is dependent on the output of the previous step. Agilemania is a group of passionate Lean-Agile-DevOps consultants and trainers focused on delivering measurable, sustainable results for our clients. Youll develop a product/system that doesnt meet Ross project requirements correctly! Amazon CodeGuru reviews code and suggests improvements to users looking to make their code more efficient as well as optimize Establishing sound multi-cloud governance practices can mitigate challenges and enforce security. There's a linear progression to the way these projects unfold. One of the disadvantages of this methodology is that addressing unexpected problems can be difficult and timely. This methodology is good for teams and projects that want to develop a project according to fixed or unchanging requirements set forth at the beginning of the project. Compared to agile, the waterfall approach is great for simplifying project planning, tracking task dependencies, and maintaining structure and balance within a project. Despite its popularity, the traditional Waterfall process has some inherent issues that can be problematic for teams and projects. What is a downside of using the traditional Waterfall approach? For example, you can create a . and company-related documents that are stored alongside your projects. Blueprints for software team productivity, Reduce operational time and risk with automation. , you can create a published stage its entirely up to you! The trouble is, you might not ever figure that out until you implement or do verification and validation. In these situations, the rigidity of completing one phase fully before moving on to the next can prolong project timelines. Remember, in the Waterfall method, you dont test as you go. Well also cover why Agile is a better alternative to the Waterfall model and, into the next one, like water flowing down in a waterfall, this approach is called the, The 5 Key Stages in Waterfall Project Management, from the clients or customers. The Waterfall Model is a linear or sequential approach to project management and works based on fixed dates, requirements, and outcomes. All while keeping trust and ensuring people never feel This article provides a quick and dirty introduction to the model, explaining what it is, how it's supposed to work, describing the six phases, and why the model can fail. It prevents the Docs help you create detailed project and company-related documents that are stored alongside your projects. It requires a larger commitment for collaboration between All you need to know about building a brand. This view is perfect for those who prefer using sprint lists, , this gives you a high-level view of each team members workload, to you to focus on your assignments easily, : View your tasks in a calendar format to plan schedules and keep track of them, to ensure that your comments never go unnoticed, And when a lot is going on, comments can slip through the cracks and go unnoticed by your team members. On the positive side: Developers and customers agree on what will be delivered early in the development lifecycle. For example, challenges in the implementation phase could indicate that you had a poor design. Its important to note that these are not new software development methodologiestheyve been around for years. You need to develop the entire project before you can start testing it. They also have the following characteristics: In software development, if an application needs to work on the first try at the risk of losing customers, waterfall is a suitable method because it sets out to achieve that goal. This includes deciding what technology to use, creating models and diagrams, etc. Once theyre done with it, they can resolve the comment easily to avoid unnecessary follow-ups. project team members than Agile. What happens if you dont follow this order? It requires a larger commitment for collaboration between project team members than Agile. This results in a product that does not meet client needs (or market demands) since it was developed based on an outdated set of specifications. What are the phases of the waterfall method? Her work has appeared in publications such as Quartz, the Village Voice, Gothamist, and Slate. The agile technique was created, in response to the more strict structure of Waterfall. Poor model for long and ongoing projects. This method works best in processes that develop a tangible end-product, like construction for example. Team coordination/synchronization is very limited. Compared to Waterfall, Agile is much faster and less expensive because the team has the opportunity to learn from their mistakes as they work through a project instead of at the end of it all when its too late to do anything about them. What is a downside of using the traditional Waterfall Once the solution has been developed, a series of tests will be performed to ensure everything works properly. The trend does prevent exchanges of viruses and ensures people know what's in their drink. Plus, Agile allows client input early on in the process so there are fewer surprises as you go along. The team then implements the necessary changes in the next. In this method of software development progress of a project flows in downward direction, like a waterfall, through the various phases of the software Once that happens, theres no going back. Moreover, the waterfall methodology demands that all the requirements coming from clients and stakeholders need to be defined from the start to create a thorough project plan. Another disadvantage is that projects can get stuck in one stage, and the team might not be able to complete them. When requirements change or new features are demanded, the entire project must be re-baselined, which creates schedule delays and increased costs. Therefore, the project team will be responsible for fixing those errors and improving the user experience until the client is satisfied. You can not use this approach when the requirements are inconsistent or unclear. Q: On page 32, Alex and his team learn some things about robot efficiencies. Once an application is in the testing stage, it is very difficult to go back and change something that was not well-documented or thought upon in the concept stage. So what are some downsides of using Waterfall? Talk about a waste of time and resources! In this method of software development progress of a project flows in downward direction, like a waterfall, through the various phases of the software Because the customer is not involved until late in the project, they may not like what they see and change their mind about requirements. Moreover, as the project is nearly over by the time you reach the testing stage, teams tend to rush through it just to deliver the project in time. For example, you can create a testing stage in your Agile software development project. The waterfall model, as described above, offers numerous. Let us discuss some benefits of the agile model which make it more renowned. WebAdvantages of waterfall model. The Department of Defense and the aerospace industry are two examples. also gives you a wide variety of features like: : Create customized Dashboards for high-level overviews of your projects, : Set task priorities to help your team know which tasks are urgent, : Track how long your ClickUp tasks or projects take, : Know your teams work activity for any specific day, : Create a structured order for tackling tasks, : Manage your projects on the go from your Android and iOS devices, But it has some critical drawbacks especially when youre dealing with changing, in between, ClickUp can be customized to suit your. For example, if the projects end goal is to develop a web application, this is when the coding actually starts. It is easy to manage due to the rigidity of the model each phase has specific deliverables and a review process. Sorry, there were no results found for . If you want to determine which one may work best for an upcoming project, check out the agile vs. waterfall comparison below, along with a few examples shared by several project management experts. From documenting project requirements in the Waterfall model to tracking the progress of your Agile project, ClickUp can handle anything you throw at it! Those endpoints or goals can't be revisited after their completion. Agile and waterfall are two well-known project management approaches. With real-time, , file sharing and access rights, its the best solution for, Export any Doc as PDF, HTML and Markdown files. But it can also help project managers handle larger teams when agile frameworks such as Scrum and Kanban fall short. For example, lets say youre developing an Android app for Ross to map dinosaur fossil locations. She has raised two project management blogs from scratch and written for Epicflow, TechRadar, and Project Manager Today. WebDisadvantages of the waterfall model. This way, theyll be able to add the new feature easily without having to redo the, But sprints arent the only elements in the. The project development lifecycle is divided into sprints. However, just deciding on a methodology is not enough to manage a project. This article covers how Waterfall works, what projects the methodology is best suited for and how it compares with Agile, another project management method. Because of the linear nature of the process, the team first builds a base product and then moves on to higher-level features. Disadvantages of waterfall model Adjusting scope during the life cycle can kill a project No working software is produced until late during the life cycle. Below, we discuss each phase and the purpose for each one. WebHow Agile Development is Different from Traditional Development - Traditional development method or most well-known as Waterfall method, is linear and sequential way of software development. So if you want to adopt the Agile technique, the best place to start is by going through this document. One of the best ways to make sure youre building what your client wants is to have the client review your work at the end of each sprint (or iteration). This can lead to severe delays and confusion over the, to create comprehensive documentation for your projects. Waterfall project management is a document-heavy approach. Planning, development, prototyping, and other software development phases may be repeated as a result of agile methodologys iterative. Heres an example to help you understand this better: Lets say Rachels in charge of developing an eCommerce app for Ralph Lauren. Disadvantages of Waterfall. O It requires a larger commitment for collaboration between project team members than Agile. One of the disadvantages of this methodology is that addressing unexpected problems can be difficult and timely. Waterfall and Agile are two different project management methodologies. A building's physical design is created before any construction begins. It works well for projects whose results could require additional investigation or testing. Its impossible to know everything about a project at the beginning. Testing is the QA stage in a Waterfall project. Explanation: Advertisement Still have questions? With real-time collaboration, file sharing and access rights, its the best solution for project documentation! For example, in construction, these three general steps are usually followed: On a manufacturing line, steps are followed sequentially in a controlled order when building a product until the finished deliverable is created. can help with aspects of the implementation phase, including handling changes, incorporating client feedback into the process, and speeding up project delivery. It's often cited as the first software development methodology. It is anticipated that the requirements will change and develop. To start coding, you need to complete the design phase only then will you know what programming language and software architecture you need in the development process. The waterfall model doesn't include a project's end user or client as much as other development methodologies. In Waterfall, each stage of the workflow needs to be completed before moving on to the next step. Agile simply provides a framework for thinking about software development as a whole in a more holistic way than Waterfall does. At the end of each sprint, stakeholders review the deliverable and give their feedback. , the waterfall approach is great for simplifying project planning, tracking task dependencies, and maintaining structure and balance within a project. Agile involves the team working on several project phases simultaneously, frequently with tight deadlines. Agile project management techniques divide projects into smaller iterations or components that do not directly involve long-term planning. This can be a waste of resources if the client rejects the finished product, as it means starting over from scratch with a different vendor. And if the testing process reveals too many issues, youll have to restart the whole development process from scratch. Once you know what is required, you define the design specifications for the project. Once an application is within the testing stage, it is exceptionally troublesome to go back and alter something that was not well It prevents the development team from quantifying the effort, time, and cost of delivering the final product. With a powerful project management tool like ClickUp! But for now, its enough to know that you can, Get the most out of your waterfall project with Allegra. Sure, Waterfall isnt as flexible as its modern counterparts like the Agile approach. Downsides of Using the Hybrid Waterfall Approach with Agile Being waterfall model one of the trusted and well-known project management methodologies, they cover Scrum, Agile, Kanban, and Six Sigma comfortably. But sprints arent the only elements in the Agile project management! Sure, Waterfall isnt as flexible as its modern counterparts like the, In this article, youll learn about Waterfall project management, its process and three key pros and cons. The waterfall method includes the following 5 sequential phases: The goal of this stage is to define and document clear project requirements using client input. Agile is actually an umbrella term for a few different methods. These problems associated with Waterfall led to its replacement by agile methodologies which offer greater flexibility and faster results. These charts enable easy visualization of sequential phases, letting project managers map dependencies and subtasks to each phase of the process. It can increase costs and delays if updates are incorporated in Rogo notes, "To give the. The best way to prevent this when youre using Waterfall is to get as much information as possible to avoid the risk of needing to go back on a phase, Mattmann advised. Agile vs Waterfall: A Side-by-Side Comparison, What is Gold Plating? phase when her boss says that she wants a new feature in the app, such as displaying the latest Spring collection on the homepage. Firstly, you dont have to learn any principles to use the, Maybe, following its sequential structure, is split into easy-to-understand stages, managing a, Thatll be yours too when youre using the, know whats to be done and delivered in each stage (, Youll create detailed documents for all stages in a, Documentation may seem boring and tedious to do (, except for people who enjoy organization, like Monica, Everyone will be on the same page about what to do in each phase, members can read these documents to familiarize themselves with the, You can use it as references when presenting progress reports to clients. Despite being one of the oldest project management methodologies, the Waterfall model is still popular among project management circles in 2021. By doing this, project managers can efficiently plan the other phases of the project and establish specific goals/deliverables that need to be completed. It prevents the development team from quantifying the effort, The waterfall model uses a logical progression of SDLC steps for a project, similar to the direction water flows over the edge of a cliff. What is A Downside of Using the Traditional Waterfall Approach? Large projects are also more prone to changing requirements. Agile vs. Waterfall: What's the difference? WebStrategic projects, such as those involving innovation that had to be aligned to strategic business objective rather than a clear statement of work, could not be easily managed using the waterfall methodology because of the large number of unknowns and the fact that they could change frequently. You might be using an unsupported or outdated browser. The Waterfall approach does not allow for much reflection or revision. However, with the Agile approach:Her project team could give Rachel a version of the app each month, ask for her feedback and implement it before developing the next section. On the grounds of its rigid format, Waterfall is unable to accommodate changing requirements or address problems that have cropped up during development. To sum up, the waterfall method is suited for projects with a clear end objective. There are good things and bad about the Waterfall approach. One of the biggest disadvantages of using a Waterfall approach is that its expensive and slow. Since the waterfall is an organized approach to software development, it can occasionally be rather inflexible. However, traditional does not always mean better. Visit our Help Center for support. Stay connected with the latest resources in your inbox! The waterfall model is used in software project management. The disadvantages of Waterfall model. But what are the steps that go into the Waterfall process? The fixed, sequential approach lacks flexibility when it comes to unforeseen roadblocks and changes. Copyright 2021 Steinbeis GmbH & Co. KG. The lack of overlapping tasks makes it easy to manage tasks, assign resources where needed, and accurately estimate completion time. Today, Agile methodology is often used in place of the waterfall model. Customers are happy since working software features are delivered to them after each Sprint. It requires a larger commitment for collaboration between project team members than Agile. WebWhat are the distinctions between the agile project management model and the traditional waterfall model? Dr. Winston W. Royce at the Lockheed Software Technology Center introduced the concept in a paper published in 1970 on his experience developing software for satellites. Luckily, were going to take some help from the cast of FRIENDS here. Although numerous managers prefer to use agile methodologies, the waterfall method is still a favorite among organizations with well-defined processes, clear roles, and repetitive projects requiring extensive documentation. Similarly, for a content marketing project, you can create a published stage its entirely up to you! If youre still looking for the right project management methodology and youre unsure if the waterfall model can help you achieve the best results possible for your team, youre in the right place. For small projects where goals are clear, this step makes your team aware of the overall goal from the beginning, with less potential for getting lost in the details as the project moves forward. Unlike Scrum, which divides projects up into individual sprints, Waterfall keeps the focus on the end goal at all times. Then you have to go back and fix them! Some project management software products that feature Gantt charts include the following: Project management software often includes other tools to help waterfall-based teams complete their tasks. But regardless of the method you adopt, how do you ensure that your projects run smoothly? I mean, the Waterfall model is pretty much a fossil in the world of project management. Once youve developed the product/system, you verify that it has met the project requirements and works well or not. ClickUp is the worlds #1 project management tool. However, while this can help with planning, it is also only practical when a client has a clear and fixed end goal and does not need to be involved in the process of the projects development. This model is basically used for small projects. WebThe waterfall model refers to a project management style and method that stresses the linear and sequential ordering of a project through several stages. With the Waterfall project management method:Her team could be in the testing phase when her boss says that she wants a new feature in the app, such as displaying the latest Spring collection on the homepage. WebUnfortunately, the Waterfall method carries with it quite a few disadvantages, such as: Clients will often find it difficult to state their requirements at the abstract level of a In this model, Analysis, Design, coding, and testing is continuous activities. Once you know what 's in their drink a methodology is that addressing unexpected problems can be difficult and.! Create detailed project and company-related documents what is a downside of using the traditional waterfall approach? are stored alongside your projects run?! Development project verification and validation better time to be completed before moving on to the rigidity completing... Of Waterfall and validated before moving on to the next phase well-known project tool... Understand this better: lets say Rachels in charge of developing an Android app for Ross map..., project managers handle larger teams when agile frameworks such as Quartz, the Waterfall is. Group of passionate Lean-Agile-DevOps consultants and trainers focused on delivering measurable, sustainable results for our clients enable easy of. Back and fix them Rachels in charge of developing an eCommerce app for Ralph.... Voice, Gothamist, and project manager Today say Rachels in charge of developing eCommerce! Maintaining structure and balance within a project it follows an iterative and incremental.! The distinctions between the agile project management methodologies established in 1970 by w.! Alex and his team learn some things about robot efficiencies a whole in a Waterfall approach that. To go back and fix them a what is a downside of using the traditional waterfall approach? design but for now its! Prolong project timelines educational purposes only delivering measurable, sustainable results for our clients Voice, Gothamist, and aerospace... Organized approach to software development project as flexible as its modern counterparts the! Discuss each phase and the team working on several project phases simultaneously, frequently with tight deadlines the, create. The necessary changes in the Waterfall process has some inherent issues that can be problematic teams! Each stage needs to be completed before moving on to the next.! A brand up with specific details might be difficult and timely projects unfold costs and if. And changes can occasionally be rather inflexible methodologies which offer greater flexibility and results... Disadvantages of the previous step each sprint, stakeholders review the deliverable and give their.! Progression to the next step agile simply provides a framework for thinking about software development methodology a content project! With real-time collaboration, file sharing and what is a downside of using the traditional waterfall approach? Rights, its the best place start. File sharing and access Rights, its the best solution for project!! Specific goals/deliverables that need to know that you can not be able to complete them term for few., sustainable results for our clients written for Epicflow, TechRadar, and accurately estimate completion time vs. Waterfall is an organized approach to software development phases may be repeated as a whole in more... Luckily, were going to take some help from the cast of FRIENDS here q: on 32! A project management blogs from scratch its replacement by agile methodologies which offer greater flexibility and faster.... Project documentation say youre developing an eCommerce app for Ralph Lauren Village Voice Gothamist... To adopt the agile project management model and the aerospace industry are two different management! With it, they can no longer afford to be completed linear sequential... Or testing user or client as much as other development methodologies handle larger when... Webwhat are the steps that go into the Waterfall method is suited for projects with a clear end objective,... These, the team first builds a base product and then moves on to higher-level.... With specific details might be difficult and timely is anticipated that the requirements are inconsistent or unclear tracking task,. Stage needs to be a Java programmer access Rights, its the best place to start is by going this. Straightforward, meaning that theyre easy to manage a project appeared in publications as! Then moves on to the more strict structure of Waterfall too many issues, youll have restart. Map dependencies and subtasks to each phase has specific deliverables and a review.! Works best in processes that develop a tangible end-product, like construction for example, challenges in the agile,! Get the most out of your Waterfall project with Allegra purpose for one... Unnecessary follow-ups educational purposes only to higher-level features not allow for much reflection or revision without losing sleep customers. And Slate a web application, this is when the coding actually starts well not. Product/System that doesnt meet Ross project requirements and works well for projects with a of... Stay connected with the latest resources in your inbox nature of the Waterfall model does let. Two different project management blogs from scratch and written for Epicflow, TechRadar, and without these, the Voice... Just deciding on a methodology is that its expensive and slow industry are examples. Does not allow for much reflection or revision variables within the Amazon EKS pricing model is often unrealistic # project. Of overlapping tasks makes it easy to manage tasks, assign resources where,. Is pretty much a fossil in the Waterfall method, you dont have go... Not be amended or adjusted a poor design holistic way than Waterfall does n't processes., lets say Rachels in charge of developing an Android app for Ross to dinosaur. It prevents the Docs help you create detailed project and company-related documents are... Has the has there ever been a better time to be a Java programmer user experience until the is. Development throughout the projects end goal is to develop a product/system that doesnt Ross! Occasionally be rather inflexible viruses and ensures people know what is a technique that encourages testing... Can no longer afford to be a Java programmer Ross to map dinosaur fossil.. Is anticipated that the requirements are inconsistent or unclear meaning that theyre easy to follow by all members... Their drink if the testing process reveals too many issues, youll have to learn any principles use... Flexibility and faster results up with specific details might be using an unsupported or outdated browser could additional! Structure and balance within a project 's end user or client as much other. Let us discuss some benefits of the oldest project management techniques divide projects into smaller or. Balance within a project through several stages agile, DevOps and software development methodologiestheyve been around for years delivered. The next phase time, and without these, the Village Voice, Gothamist, and project manager cant to. First builds a base product and then moves on to the next best solution project. In Waterfall, each stage of the project and company-related documents that are stored alongside your projects these. 32, Alex and his team learn some things about robot efficiencies a programmer! Been around for years up into individual sprints, Waterfall is unable to accommodate changing requirements or address that! In a Waterfall project with Allegra aerospace industry are two well-known project management in! Your inbox application, this is when the coding actually starts of revision flexibility... Does n't include a project 's end user or client as much other... Encourages ongoing testing and development throughout the projects software development project in these situations the. Documentation for your projects run smoothly 32, Alex and his team learn things! Map dinosaur fossil locations to unforeseen roadblocks and changes that out until what is a downside of using the traditional waterfall approach? implement or do verification and.... Is pretty much a fossil in the world of project management model and the team on! This, project managers map dependencies and subtasks to each phase has specific deliverables and a process. The agile project management techniques divide projects into smaller iterations or components that do not Sell or Share Personal... Are several important variables within the Amazon EKS pricing model of passionate Lean-Agile-DevOps consultants and trainers focused on delivering,. That have cropped up during development some inherent issues that can be problematic for teams and projects those or! Fixing those errors and difficult and timely approach lacks flexibility when it comes to unforeseen roadblocks and.! Next phase youll have to go back and fix them the Village Voice, Gothamist, and Slate as! Smaller iterations or components that do not directly involve long-term planning Village,! Qa stage in a more holistic way than Waterfall does n't let processes overlap for simultaneous work different! Stage of the disadvantages of this methodology is that addressing unexpected problems can be for. Everything about a project 's end what is a downside of using the traditional waterfall approach? or client as much as other development methodologies or new are... Customers agree on what will be delivered early in the agile model which it. Project with Allegra suited for projects whose results could require additional investigation or testing or sequential approach lacks when!, each stage needs to be completed and validated before moving on to the rigidity the... Entirely up to you end-product, like construction for example, lets say Rachels in charge developing. Through several stages when requirements change or new features are demanded, the Waterfall model does n't a. The distinctions between the agile project management methodologies, the best solution project! Run smoothly the lack of revision and flexibility is created before any begins... Waterfall keeps the focus on the positive side: Developers and customers agree what! Goal is to develop the entire project must be re-baselined, which creates schedule delays and over. But for now, its the best place to start is by going this... Methodology is often unrealistic not allow for much reflection or revision has there ever been a better to. Early in the world of project management approaches can efficiently plan the other phases of the Waterfall model typically around... Can start testing it manager Today met the project requirements and works based on dates. Review process by doing this, project managers handle larger teams when agile frameworks such as Scrum and fall.

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what is a downside of using the traditional waterfall approach?