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Project Planning
Published in Joseph Eli Kasser, Systemic and Systematic Project Management, 2019
The waterfall model was developed as a planning tool in a time when the requirements didn’t change very quickly. This may have been because microcomputers had not been invented and systems were created in hardware which was difficult to change. The waterfall model is easy to teach and understand and is still applicable and controllable and can cope with changes in requirements. The waterfall model copes with changes in requirements: As long as the time taken to progress through the states in the waterfall is shorter than the time between changes.The project has a working change management system and can adjust the workload to meet the changes in the need. This may require reverting to previous stages in the waterfall depending on the nature the change request (Section 11.3.2).
Software Development Methodologies
Published in Marvin Gechman, Project Management of Large Software-Intensive Systems, 2019
Introduction of the Waterfall Model in the 1970s provided a major contribution to the understanding and management of the software development process because it was monumentally better than the haphazard software development approach typically followed at that time. The Iterative Waterfall with feedback loops and prototyping, as shown in Figure 4.4, is a more effective approach. However, other good options exist as described in this chapter. The Waterfall Model, or a version of it, is often used as an integral part of other methodologies and currently many information systems and projects are developed using versions of the Waterfall Model. Lessons Learned. For those who balk at the thought of following a sequential process, I ask them to be realistic. You crawl before you walk and you walk before you run. That is the way it is. You cannot realistically do any meaningful coding until you understand what the code is supposed to do—you need a design. But before you can create a realistic design, you need to understand the requirements for what you are building. And you cannot test the final product until you have the requirements for the system you are testing to make sure the developed product is responsive to those requirements. That is the way it is. Live with it!
Engineering design
Published in Riadh Habash, Green Engineering, 2017
In terms of management processes, there are various methods within SE to guide the design life cycle, including the waterfall, spiral, and Agile models (Haskins et al. 2010). The waterfall model is a sequential development model where requirement should be clear before going to the next phase of design and each phase of development proceeds in order without any overlapping. Agile stands for moving quickly. However, the emergence of all above design life cycle management processes is the design V (validation and verification)-model, which represents the different phases in design and the coordination activities that should occur across them at each step (Haskins et al. 2010). Verification is the process of proving that each product meets its specification. Validation is the process of demonstrating that the product satisfies the user needs, regardless of what the system specification requires. Figure 8.15 shows an overview project development within the V-model.
Using Social Intelligence to Overcome Agile Adoption Challenges
Published in Journal of Computer Information Systems, 2022
Large organizations steeped in traditional plan-driven software project management approaches such as waterfall are increasingly adopting agile software development methods such as SCRUM and Extreme Programming.1,2 The waterfall model is a sequential process of software development in which the software is produced in a series of fixed phases (i.e., requirements gathering, design, coding, testing, and deployment), with each phase requiring the analysis and work from the previous phase as its input. The software team spends considerable time in each phase and moves to the next only when all doubts and ambiguities have been minimized.3 Spending considerable time and effort in the initial stages should reduce software defects in advance.3 Here, providing detailed documentation in each phase is emphasized.3 Moreover, agile models are adaptable, as they develop the software through multiple iterations, with each iteration cycling through requirements gathering, design, coding, and testing. Here, the speed of delivering a working software product to the customer is emphasized. Compared with the set-in-stone approach of the waterfall model, customer feedback determines the next course of changes, with the product evolving over time.3
Towards a Systematic Requirement-Based Approach to Build a Neutronics Study Platform
Published in Nuclear Science and Engineering, 2023
Alberto Previti, Alberto Brighenti, Damien Raynaud, Barbara Vezzoni
The classical starting point to systematically break down project activities also applied to software development is the so-called Waterfall model.22 Under this approach, the activities are decomposed in a series of linear sequential phases. The first step is the generation of requirements of the system. The requirements analysis is the heart of the design phase, in which most of the technical choices are made. Afterward, the development phase takes place until the code is ready for testing and then released to production.
Compositional interaction design—changes in design practice and its implications for teaching and research
Published in Digital Creativity, 2020
Erik Stolterman, Mikael Wiberg
Today the waterfall model is not commonly used in our field (maybe with the exception when used as a project management tool). While there might be many reasons for why that is the case, the problem with this model is that it does not account for working with the alignment of existing elements into larger wholes (Nelson and Stolterman 2012), a key component in the compositional practice that we focus on in this paper.