{"id":1231,"date":"2018-02-13T10:03:57","date_gmt":"2018-02-13T10:03:57","guid":{"rendered":"https:\/\/www.h2kinfosys.com\/blog\/?p=1231"},"modified":"2025-02-18T02:09:15","modified_gmt":"2025-02-18T07:09:15","slug":"sdlc-sequential-model","status":"publish","type":"post","link":"https:\/\/www.h2kinfosys.com\/blog\/sdlc-sequential-model\/","title":{"rendered":"SDLC &#8211; Sequential Model"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\"><strong>Introduction<\/strong><\/h2>\n\n\n\n<p>Software development is a complex process that requires structured methodologies to ensure quality, efficiency, and timely delivery. One such approach is the <strong>Sequential Model<\/strong> of the <strong>Software Development Life Cycle (SDLC)<\/strong>. Often referred to as the <strong>Waterfall Model<\/strong>, this method follows a linear, step-by-step approach where each phase must be completed before moving to the next.<\/p>\n\n\n\n<p>The <a href=\"https:\/\/www.h2kinfosys.com\/blog\/sdlc-models\/\">SDLC Sequential Model<\/a> is one of the oldest and most widely used software development methodologies. It was introduced in the early days of software engineering when organizations needed a systematic approach to manage complex projects. This model ensures that each stage is completed in a sequential manner, which helps in minimizing errors and enhancing project stability.<\/p>\n\n\n\n<p>For aspiring <strong>QA testers<\/strong>, understanding this model is essential as it lays the foundation for structured testing and quality assurance practices. The model&#8217;s predictability and clear documentation make it a preferred choice for industries like healthcare, banking, and government projects, where compliance and stability are crucial.<\/p>\n\n\n\n<p>If you&#8217;re exploring <strong><a href=\"https:\/\/www.h2kinfosys.com\/courses\/qa-online-training-course-details\/\">Quality Assurance Tester Courses<\/a><\/strong> or looking for <strong>QA tester training<\/strong>, this guide will help you grasp the significance of the SDLC Sequential Model and its role in software testing. By mastering this model, QA testers can efficiently validate software functionality, mitigate defects early in the cycle, and ensure high-quality product delivery.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What is the SDLC Sequential Model?<\/strong><\/h2>\n\n\n\n<p>The SDLC-<strong>Sequential Model<\/strong> follows a strict, structured flow of phases in software development. Each phase has distinct deliverables, and moving backward is challenging, making it ideal for well-defined projects.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Phases of the SDLC Sequential Model<\/strong><\/h3>\n\n\n\n<p>The approaches to developing the software can be broadly classified into the sequential approach and iterative\/incremental approaches. The classification of the SDLC models in software development is due to the differential project scenarios. The varying environments of software development, technology, client requirements, budget constraints etc. constitute the project scenarios. The IT Project Manager or IT company framework chooses the most appropriate SDLC model for software development.<br><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-1233\" src=\"https:\/\/www.h2kinfosys.com\/blog\/wp-content\/uploads\/2018\/02\/sdlc-modules.png\" alt=\"\" width=\"696\" height=\"374\" title=\"\" srcset=\"https:\/\/www.h2kinfosys.com\/blog\/wp-content\/uploads\/2018\/02\/sdlc-modules.png 696w, https:\/\/www.h2kinfosys.com\/blog\/wp-content\/uploads\/2018\/02\/sdlc-modules-300x161.png 300w\" sizes=\"(max-width: 696px) 100vw, 696px\" \/><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Requirement Analysis<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Objective:<\/strong> Gather and document software requirements.<\/li>\n\n\n\n<li><strong>Role of QA:<\/strong> Ensure clear, testable requirements to prevent ambiguity.<\/li>\n\n\n\n<li><strong>Example:<\/strong> An e-commerce website project requiring a cart, payment gateway, and user authentication.<\/li>\n\n\n\n<li><strong>Best Practices:<\/strong> Conduct stakeholder interviews, create requirement traceability matrices, and use tools like JIRA for documentation.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. System Design<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Objective:<\/strong> Convert requirements into a structured software blueprint.<\/li>\n\n\n\n<li><strong>Role of QA:<\/strong> Identify design inconsistencies that may lead to defects.<\/li>\n\n\n\n<li><strong>Example:<\/strong> Defining database schemas, UI\/UX wireframes, and backend APIs.<\/li>\n\n\n\n<li><strong>Best Practices:<\/strong> Leverage UML diagrams, perform design walkthroughs, and collaborate closely with developers.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Implementation (Coding)<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Objective:<\/strong> Develop the actual software based on design.<\/li>\n\n\n\n<li><strong>Role of QA:<\/strong> Prepare <strong>test cases<\/strong> and conduct <strong>unit testing<\/strong>.<\/li>\n\n\n\n<li><strong>Example:<\/strong> Writing login module code and verifying correct password validation.<\/li>\n\n\n\n<li><strong>Best Practices:<\/strong> Use code reviews, static code analysis tools, and <a href=\"https:\/\/en.wikipedia.org\/wiki\/CI\/CD\" rel=\"nofollow noopener\" target=\"_blank\">CI\/CD<\/a> pipelines to maintain code quality.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Testing<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Objective:<\/strong> Validate software functionality against requirements.<\/li>\n\n\n\n<li><strong>QA Focus Areas:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Functional Testing<\/strong> \u2013 Verify core functionality (e.g., login verification).<\/li>\n\n\n\n<li><strong>Performance Testing<\/strong> \u2013 Ensure scalability and speed.<\/li>\n\n\n\n<li><strong>Security Testing<\/strong> \u2013 Protect against vulnerabilities.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Example:<\/strong> Using <strong>Selenium for automated testing<\/strong> of form validations.<\/li>\n\n\n\n<li><strong>Best Practices:<\/strong> Automate repetitive test cases, perform exploratory testing, and track defects using tools like JIRA.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. Deployment<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Objective:<\/strong> Release the software to end users.<\/li>\n\n\n\n<li><strong>Role of QA:<\/strong> Conduct final acceptance testing to detect post-deployment defects.<\/li>\n\n\n\n<li><strong>Example:<\/strong> Monitoring live site performance after launching an online banking app.<\/li>\n\n\n\n<li><strong>Best Practices:<\/strong> Implement blue-green deployment strategies and use real-user monitoring tools.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>6. Maintenance<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Objective:<\/strong> Provide ongoing support, bug fixes, and updates.<\/li>\n\n\n\n<li><strong>Role of QA:<\/strong> Perform regression testing for system updates.<\/li>\n\n\n\n<li><strong>Example:<\/strong> Fixing a checkout issue after updating the payment gateway on an e-commerce website.<\/li>\n\n\n\n<li><strong>Best Practices:<\/strong> Schedule regular security patches and conduct post-release testing.<\/li>\n<\/ul>\n\n\n\n<p>The popular SDLC models that follow sequential processes are waterfall model, V model etc. Waterfall model is also known as the traditional model, classic model, predictive model. It follows the top-down approach to develop the software, hence the name waterfall model. The new requirements or changes in the requirements in the mid of the project are not acceptable. The IT team starts the software development processes with clear and complete requirements from the client. This model is applicable only for simple and low budget projects.<\/p>\n\n\n\n<p>Another popular SDLC &#8211; Sequential Model approach to develop the software is V model. The V model has the four levels of software testing- the Component(unit) testing, integration testing, system testing and acceptance testing levels. At each level of software development, different documents produced are used as Test Basis. In the component testing, each program component is tested independently in isolation by the developers. The statements, decisions, programming standards are tested at the program level. The development environment supports the component testing with the debugging tools that are inbuilt. The next level of testing is integration testing, wherein the interfaces between the programs or the modules are tested, often carried out in the development environment.&nbsp; The system testing is done by the independent software testing team. Both the functional and nonfunctional requirements of the software are tested to identify the defects and verify the software behavior. The software can be released to the client only after the approval from QA team. The various software testing tools and procedures are used for testing the software. System testing is followed by User acceptance testing(UAT). The UAT is done by end users either in the IT environment or real environment for acceptance of the software. The business analysts coordinate and software testers might have to provide testing assistance to users. The testing carried out by the end users in IT environment is termed as Alpha testing and in the real environment is termed as Beta testing. The right side of V model is termed as Validation- \u201cAre you building the right thing\u201d and left side is Verification &#8211; \u201cAre you building it right?\u201d.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"QA Testing Training | V Model in Software Development Life Cycle (SDLC) | QA Testing tutorials\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/ga-byyTWhPg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p>The sequential processes are limited to the simple projects. The changing trends in Information technology and complex software solutions required from the clients have urged the need for iterative\/incremental approaches.<\/p>\n\n\n\n<p><strong>Why is the Sequential Model Important in QA Testing?<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Clarity in Process and Documentation<\/strong><\/h3>\n\n\n\n<p>Since each phase is well-defined, QA teams receive comprehensive documentation that helps in designing robust <strong>test cases<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Easy to Manage and Control<\/strong><\/h3>\n\n\n\n<p>With a step-by-step approach, it\u2019s easier to track defects early, reducing cost overruns in the later stages.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Best for Stable Requirements<\/strong><\/h3>\n\n\n\n<p>This model is highly effective for projects with fixed requirements, such as government software, where changes are minimal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Strong Focus on Testing<\/strong><\/h3>\n\n\n\n<p>Since testing is a distinct phase, it allows dedicated attention to quality assurance, making it suitable for software that requires high reliability.fosys.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Challenges of the SDLC Sequential Model in QA Testing<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Late Testing Discovery<\/strong><\/h3>\n\n\n\n<p>Issues detected late in the process are expensive to fix since the previous phases are already locked in.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Limited Flexibility<\/strong><\/h3>\n\n\n\n<p>Changes in software requirements after the design phase require rework, increasing project costs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Extended Development Time<\/strong><\/h3>\n\n\n\n<p>Due to its rigid structure, projects using this model often take longer to complete compared to Agile methodologies.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Real-World Applications of the Sequential Model in QA Testing<\/strong><\/h2>\n\n\n\n<p>Despite its challenges, the SDLC Sequential Model is widely used in industries where software stability and thorough documentation are critical.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Healthcare Systems:<\/strong> Ensuring strict compliance with regulations like HIPAA.<\/li>\n\n\n\n<li><strong>Banking Software:<\/strong> High-security standards require sequential validation.<\/li>\n\n\n\n<li><strong>Aerospace and Defense:<\/strong> Strict documentation and controlled environments make this model suitable.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How QA Testers Can Leverage the SDLC Sequential Model<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1. Improve Requirement Validation<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tip:<\/strong> In the Requirement Analysis phase, clarify ambiguities with stakeholders to prevent defects later.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. Strengthen Test Planning<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tip:<\/strong> Design test cases early to ensure comprehensive test coverage before the testing phase begins.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. Implement Regression Testing in Maintenance<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tip:<\/strong> Automate regression testing using tools like Selenium or JUnit to detect post-deployment issues efficiently.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. Enhance Collaboration with Developers<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tip:<\/strong> Encourage <strong>early testing approaches<\/strong> such as <strong>unit testing<\/strong> and <strong>static code analysis<\/strong> to prevent late defect detection.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>The <strong>SDLC Sequential Model<\/strong> is a foundational methodology for software testing and quality assurance. While it has some limitations, its structured approach makes it ideal for projects with stable requirements. Aspiring <strong>QA testers<\/strong> must understand this model to work effectively in industries requiring strong documentation and process control.<\/p>\n\n\n\n<p>Looking to master QA testing? <strong>Enroll in <a href=\"https:\/\/www.h2kinfosys.com\/\" data-type=\"link\" data-id=\"https:\/\/www.h2kinfosys.com\/\">H2K Infosys<\/a>\u2019 QA Tester Training today<\/strong> and gain hands-on expertise to accelerate your career in software testing!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Software development is a complex process that requires structured methodologies to ensure quality, efficiency, and timely delivery. One such approach is the Sequential Model of the Software Development Life Cycle (SDLC). Often referred to as the Waterfall Model, this method follows a linear, step-by-step approach where each phase must be completed before moving to [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":11592,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[85,83,86,87],"class_list":["post-1231","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-qa-tutorials","tag-qa-tutorials","tag-sdlc","tag-sdlc-models","tag-vmodel"],"_links":{"self":[{"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/posts\/1231","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/comments?post=1231"}],"version-history":[{"count":0,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/posts\/1231\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/media\/11592"}],"wp:attachment":[{"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/media?parent=1231"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/categories?post=1231"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/tags?post=1231"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}