{"id":365,"date":"2025-11-07T01:58:53","date_gmt":"2025-11-07T01:58:53","guid":{"rendered":"https:\/\/ngahtech.com\/courses\/?page_id=365"},"modified":"2025-11-07T01:58:54","modified_gmt":"2025-11-07T01:58:54","slug":"waterfall-model","status":"publish","type":"page","link":"https:\/\/ngahtech.com\/courses\/waterfall-model\/","title":{"rendered":"Waterfall Model"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">What is the Waterfall Model?<\/h3>\n\n\n\n<p>The Waterfall Model is a\u00a0<strong>sequential, linear approach<\/strong>\u00a0to software development. In this model, the software development process flows steadily downwards through a series of distinct phases, like a waterfall. The core principle is that each phase must be\u00a0<strong>100% complete<\/strong>\u00a0and its output approved before the next phase can begin. There is no overlapping or iterative cycling between phases.<\/p>\n\n\n\n<p>It is one of the oldest and most straightforward SDLC models, rooted in traditional engineering disciplines.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The Phases of the Waterfall Model<\/h3>\n\n\n\n<p>The model is structured into the following sequential phases:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Requirements Gathering & Analysis:<\/strong>\u00a0This is the foundational phase. All possible requirements for the system to be developed are captured and documented in a\u00a0<strong>Software Requirements Specification (SRS)<\/strong>\u00a0document. This document acts as the contract for the entire project.<\/li>\n\n\n\n<li><strong>System Design:<\/strong>\u00a0Using the SRS, system architects and designers create the technical blueprint. This includes defining the overall system architecture, hardware and system requirements, and specifying how each component will work together. The output is a\u00a0<strong>Design Document Specification (DDS)<\/strong>.<\/li>\n\n\n\n<li><strong>Implementation (Coding):<\/strong>\u00a0Developers start writing code based on the DDS. The system is broken down into smaller units, and each unit is developed and tested individually (Unit Testing). This is the phase where the software is actually built.<\/li>\n\n\n\n<li><strong>Testing:<\/strong>\u00a0Once all units are developed and integrated, the entire system is tested as a whole against the requirements defined in the SRS. Quality Assurance (QA) teams perform integration, system, and user acceptance testing to identify and fix any bugs or defects.<\/li>\n\n\n\n<li><strong>Deployment:<\/strong>\u00a0After successful testing, the product is deployed to the production environment for the end-users to access and use.<\/li>\n\n\n\n<li><strong>Maintenance:<\/strong>\u00a0After deployment, the software enters the maintenance phase. This involves fixing any undiscovered bugs, providing ongoing support, and releasing updates or patches for performance improvement. This phase continues for the life of the software.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Key Characteristics<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sequential & Phased:<\/strong>\u00a0Each phase has a defined start and end point.<\/li>\n\n\n\n<li><strong>Milestone Oriented:<\/strong>\u00a0The output of one phase is the input for the next.<\/li>\n\n\n\n<li><strong>Document-Driven:<\/strong>\u00a0Heavy emphasis on comprehensive documentation at each stage (SRS, DDS, etc.).<\/li>\n\n\n\n<li><strong>Inflexible:<\/strong>\u00a0It is very difficult and expensive to go back and change requirements once a phase is completed.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">A Practical Example: How\u00a0<a href=\"https:\/\/ngahtech.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ngahtech.com<\/a>\u00a0Would Use the Waterfall Model<\/h3>\n\n\n\n<p>Let\u2019s imagine a client approaches\u00a0<strong><a href=\"https:\/\/ngahtech.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ngahtech.com<\/a><\/strong>\u00a0to develop a\u00a0<strong>software system for generating annual tax compliance reports<\/strong>\u00a0for a financial institution.<\/p>\n\n\n\n<p>This project is a perfect fit for the Waterfall Model. Here\u2019s why and how Ngahtech would execute it:<\/p>\n\n\n\n<p><strong>Why Waterfall is a Good Fit:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Fixed Requirements:<\/strong>\u00a0The requirements are based on government tax laws, which are clear, fixed, and unlikely to change during the project.<\/li>\n\n\n\n<li><strong>Clear Deliverables:<\/strong>\u00a0The final output is well-defined: a system that generates specific, compliant reports.<\/li>\n\n\n\n<li><strong>Minimal Client Ambiguity:<\/strong>\u00a0The client knows exactly what they need, and there is little room for \u201cdiscovery\u201d during development.<\/li>\n<\/ul>\n\n\n\n<p><strong>How\u00a0<a href=\"https:\/\/ngahtech.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">Ngahtech.com<\/a>\u00a0Executes the Phases:<\/strong><\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Requirements Gathering:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Ngahtech\u2019s business analysts work with the client and tax experts.<\/li>\n\n\n\n<li>They produce a massive, detailed\u00a0<strong>SRS document<\/strong>\u00a0that lists every single input, calculation, output format, and compliance rule. The client\u00a0<strong>signs off<\/strong>\u00a0on this document, freezing the requirements.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>System Design:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Based on the signed SRS, Ngahtech\u2019s solution architects design the system.<\/li>\n\n\n\n<li>They decide on the database schema, the reporting engine, the user interface for data entry, and the security protocols. This is all documented in a\u00a0<strong>Design Document (DDS)<\/strong>. No code is written yet.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Implementation:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Developers at Ngahtech now start coding strictly according to the DDS. They build the data entry forms, the calculation logic for tax rules, and the report generators. This phase takes several months.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Testing:<\/strong>\n<ul class=\"wp-block-list\">\n<li>After coding is complete, QA engineers test the entire system. They input sample financial data and verify that every calculation matches the tax laws defined in the original SRS. They check for bugs and ensure the reports are 100% accurate.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Deployment:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Once the system passes all tests, it is installed on the client\u2019s servers. The client\u2019s staff is trained on how to use it.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Maintenance:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Ngahtech provides a support contract. If a bug is found or if a tax law changes slightly next year, Ngahtech will make the necessary patches (a form of maintenance) under a new, smaller project scope.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">Advantages and Disadvantages<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Advantages<\/th><th>Disadvantages<\/th><\/tr><\/thead><tbody><tr><td>\u2705\u00a0<strong>Simple and easy to understand.<\/strong><\/td><td>\u274c\u00a0<strong>Inflexible.<\/strong>\u00a0Making changes is extremely costly and difficult once a phase is complete.<\/td><\/tr><tr><td>\u2705\u00a0<strong>Disciplined and structured.<\/strong><\/td><td>\u274c\u00a0<strong>Late Working Model.<\/strong>\u00a0The client only sees the final product at the very end, which is high-risk.<\/td><\/tr><tr><td>\u2705\u00a0<strong>Clear milestones and deliverables.<\/strong><\/td><td>\u274c\u00a0<strong>High Uncertainty.<\/strong>\u00a0If initial requirements are wrong, the entire project can fail.<\/td><\/tr><tr><td>\u2705\u00a0<strong>Well-documented.<\/strong><\/td><td>\u274c\u00a0<strong>Not suitable for complex or object-oriented projects.<\/strong><\/td><\/tr><tr><td>\u2705\u00a0<strong>Works well for small, well-understood projects.<\/strong><\/td><td>\u274c\u00a0<strong>Poor fit for long-term or ongoing projects where requirements evolve.<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is the Waterfall Model? The Waterfall Model is a\u00a0sequential, linear approach\u00a0to software development. In this model, the software development [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":366,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-365","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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