{"id":7635,"date":"2020-02-03T07:22:00","date_gmt":"2020-02-03T07:22:00","guid":{"rendered":"https:\/\/www.intexsoft.com\/?post_type=blog&#038;p=7635"},"modified":"2022-07-19T13:01:54","modified_gmt":"2022-07-19T13:01:54","slug":"software-development-life-cycle-models","status":"publish","type":"blog","link":"https:\/\/intexsoft.com\/blog\/software-development-life-cycle-models\/","title":{"rendered":"Software Development Life Cycle Models"},"content":{"rendered":"<section  class=\"hero hero-blog \">\n\t<div class=\"content\">\n\t\t\t\t\t<div class=\"hero__overlay\"><\/div>\n\t\t\t\t<div class=\"hero__container\">\n\t\t\t<a href=\"https:\/\/intexsoft.com\/blog\/\">\n\t\t\t\t<div class=\"hero-blog-btn\">\n\t\t\t\t\t\n\t\t\t\t<\/div>\n\t\t\t<\/a>\n\t\t\t<div class=\"hero-blog-date-author\"> February 3, 2020 \u2022 by \t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tAlexandra\n\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<h1 class=\"hero__title \">Software Development Life Cycle Models<\/h1>\n\t\t\t\t\t\t\t\t\t\t<div class=\"hero-blog-categories\">\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"hero-blog-category\" data-id=\"17\" data-parent=\"0\">\n\t\t\t\t\t\t\tPainless development\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div class=\"hero-blog-image\">\n\t\t\t\t<picture>\n\t\t\t\t\t\t\t\t\t\t\t<source type=\"image\/webp\" srcset=\"https:\/\/intexsoft.com\/app\/uploads\/uploads-webp\/2021\/08\/360\u0445510-Software-Development-Life-Cycle-Models-min.jpg.webp\" media=\"(max-width: 480px)\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<source type=\"image\/webp\" srcset=\"https:\/\/intexsoft.com\/app\/uploads\/uploads-webp\/2021\/08\/768\u0445773-Software-Development-Life-Cycle-Models-min.jpg.webp\" media=\"(max-width: 992px)\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<source type=\"image\/webp\" srcset=\"https:\/\/intexsoft.com\/app\/uploads\/uploads-webp\/2021\/08\/1920x437-Software-Development-Life-Cycle-Models-min.jpg.webp\">\n\t\t\t\t\t\t\t\t\t\t<source srcset=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/360\u0445510-Software-Development-Life-Cycle-Models-min.jpg\" media=\"(max-width: 480px)\">\n\t\t\t\t\t<source srcset=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/768\u0445773-Software-Development-Life-Cycle-Models-min.jpg\" media=\"(max-width: 992px)\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/1920x437-Software-Development-Life-Cycle-Models-min.jpg\" loading=\"lazy\" alt=\"image\">\n\t\t\t\t<\/picture>\n\t\t\t<\/div>\n\t\t\t<\/div>\n<\/section>\n\t\t\t\t\t\t\t\n\t\t\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\"><section id=\"\"\n\t\t\t\t\t class=\"custom-wysiwyg-editor wysiwyg-portfolio \">\n\t\t<div class=\"content\">\n\n\n\n\t\t\t\t\t\t\t\n\t\t\t\t<div class=\"custom-wysiwyg-editor__anchors\">\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<p><span style=\"color: #333333;\">Have you ever thought that the notion \u201clife cycle\u201d can refer not only to living beings? Everything has a life cycle: organizations, brands, machines, and even software. In today&#8217;s article, we will talk specifically about such a life cycle and its models. We will tell you what the life cycle is, what models are used more often and which model is the best one for developing your product.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #000000;\">What is a software development life cycle?<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">The <a href=\"https:\/\/intexsoft.com\/full-cycle-software-development-services\/\">software development life cycle (SDLC)<\/a>\u00a0is a process that begins from the moment you decide to develop a product and ends when this product is completely removed from service.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #000000;\">Stages of software development life cycle<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">These models in particular determine the development stages of a new product, its sequence and cyclicality. Still, five main stages of the life cycle have their place in each model:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\"><b>Requirements planning and analysis<br \/>\n<\/b>\u00a0At this stage, the client\u2019s requirements for the final product are discussed, analyzed, and adjusted. As a result, the parties come to a common decision (this is an extremely important stage since the project requirements are the determining factor when choosing a model);<br \/>\n<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\"><b>Designing of architecture<br \/>\n<\/b>Most technical issues are solved at this stage, for example, which technologies are better to use to develop a specific application, or how frontend and backend components should interact with each other, etc.;<br \/>\n<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\"><b>Development<br \/>\n<\/b>Programmers begin to write code based on the requirements defined earlier;<br \/>\n<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\"><b>Testing<br \/>\n<\/b>At this stage, QA engineers look for inconsistencies with customer requirements in a developed product and report them to developers for revision;<br \/>\n<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\"><b>Deployment<\/b><br \/>\nIt is the stage of transmission of the project code into working condition on a specific machine, adaptation, launch and testing on a new machine.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">There are\u00a0five basic models of the development life cycle\u00a0to facilitate the planning of design, development and release of a quality product:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">Waterfall;<\/span><\/li>\n<li><span style=\"color: #333333;\">Iterative;<\/span><\/li>\n<li><span style=\"color: #333333;\">V-model;<\/span><\/li>\n<li><span style=\"color: #333333;\">Agile;<\/span><\/li>\n<li><span style=\"color: #333333;\">Spiral.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #000000;\">SDLC Waterfall model<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Each stage of the project is carried out once and in strict sequence. In order to begin a new stage, it is necessary to complete the previous one.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">The sequence of stages in the Waterfall model is as follows:<\/span><\/p>\n<p>&nbsp;<\/p>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7650\" src=\"https:\/\/www.intexsoft.com\/app\/uploads\/2021\/08\/waterfall-model.jpg\" alt=\"\" width=\"1000\" height=\"662\" data-wp-editing=\"1\" srcset=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/waterfall-model.jpg 1000w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/waterfall-model-300x199.jpg 300w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/waterfall-model-768x508.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\">The sequence of stages in the Waterfall model<\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"color: #000000;\">Pros and Cons of Waterfall model<\/span><\/h3>\n<h4><\/h4>\n<p><strong><span style=\"color: #333333;\"><br \/>\n<\/span><\/strong><span style=\"color: #333333;\">Pros:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">the model is easy to understand and apply;<\/span><\/li>\n<li><span style=\"color: #333333;\">easy to identify key development points;<\/span><\/li>\n<li><span style=\"color: #333333;\">easy to classify and prioritize tasks;<\/span><\/li>\n<li><span style=\"color: #333333;\">perfect for short and medium-term projects, with clear, not changing requirements.<\/span><span style=\"color: #333333;\"><br \/>\n<\/span><strong><br \/>\n<\/strong><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Cons:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">you cannot go back to the previous stages to make changes to the project;<\/span><\/li>\n<li><span style=\"color: #333333;\">product can be released only when it passes all stages;<\/span><\/li>\n<li><span style=\"color: #333333;\">the model does not provide activities aimed at risk analysis;<\/span><\/li>\n<li><span style=\"color: #333333;\">not suitable for long-term projects where changes may be required at any stage.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #000000;\">Iterative development model<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">According to this model, the software is developed in a linear sequence of stages, but in several iterations. Thus, product improvements are planned and take place throughout the entire development life cycle.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">The sequence of stages during development, in this case, will look like this:<\/span><\/p>\n<p>&nbsp;<\/p>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7647\" src=\"https:\/\/www.intexsoft.com\/app\/uploads\/2021\/08\/iterative-model.jpg\" alt=\"\" width=\"1000\" height=\"662\" srcset=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/iterative-model.jpg 1000w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/iterative-model-300x199.jpg 300w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/iterative-model-768x508.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\">The sequence of stages in Iterative model<\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"color: #000000;\">Pros and Cons of Iterative model<\/span><\/h3>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Pros:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">changes and new requirements can be introduced gradually;<\/span><\/li>\n<li><span style=\"color: #333333;\">it is possible to control the course of development;<\/span><\/li>\n<li><span style=\"color: #333333;\">risks associated with costs and schedule compliance can be reviewed;<\/span><\/li>\n<li><span style=\"color: #333333;\">if necessary, the product can be released with minimal functionality after the first delivery;<\/span><\/li>\n<li><span style=\"color: #333333;\">the model is perfect for developing products that require constant updates.<\/span><\/li>\n<\/ul>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Cons:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">intermediate and final delivery dates may be delayed due to limited resources;<\/span><\/li>\n<li><span style=\"color: #333333;\">if many changes are often made, the structure of the system may be disrupted.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #000000;\">SDLC V-model<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">This model has become a follower of the Waterfall model, but with its help you can eliminate the defects that were missed earlier. In this model, processes are monitored at all stages to ensure the possibility of moving to the next level. The testing process begins at the stage of writing requirements.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Stages in the development of a V-shaped model:<\/span><\/p>\n<p>&nbsp;<\/p>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7649\" src=\"https:\/\/www.intexsoft.com\/app\/uploads\/2021\/08\/v-model.jpg\" alt=\"\" width=\"1000\" height=\"662\" srcset=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/v-model.jpg 1000w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/v-model-300x199.jpg 300w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/v-model-768x508.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\">The sequence of stages in v-model<\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"color: #000000;\">Pros and Cons of V-model<\/span><\/h3>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Pros:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">strict stages;<\/span><\/li>\n<li><span style=\"color: #333333;\">optimized time management;<\/span><\/li>\n<li><span style=\"color: #333333;\">minimal risks since testing starts at the earliest stages.<\/span><\/li>\n<\/ul>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Cons:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">there are no actions aimed at risk analysis;<\/span><\/li>\n<li><span style=\"color: #333333;\">long development process often leads to the fact that the customer may have no need for a product;<\/span><\/li>\n<li><span style=\"color: #333333;\">product can be released only when it passes all the stages.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #000000;\">SDLC Spiral model<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">In this model, the product\u2019s life path is like a spiral, which gets unwound from the planning stage, and with the passage of every further step. Thus, at the exit from another round, we get a ready-tested prototype that complements the existing assembly. If the prototype meets all the requirements, it can be released.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Illustration of the spiral model development process:<\/span><\/p>\n<p>&nbsp;<\/p>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7648\" src=\"https:\/\/www.intexsoft.com\/app\/uploads\/2021\/08\/spiral-model-sdlc.jpg\" alt=\"\" width=\"1000\" height=\"662\" srcset=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/spiral-model-sdlc.jpg 1000w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/spiral-model-sdlc-300x199.jpg 300w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/spiral-model-sdlc-768x508.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\">The sequence of stages in Spiral model<\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"color: #000000;\">Pros and Cons of Spiral model<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Pros:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">possible flexibility of design;<\/span><\/li>\n<li><span style=\"color: #333333;\">additional functionality can be added at later stages;<\/span><\/li>\n<li><span style=\"color: #333333;\">special attention is paid to risk management;<\/span><\/li>\n<li><span style=\"color: #333333;\">the model is perfect for large projects.<\/span><\/li>\n<\/ul>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Cons:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">change of requirements may cause delays in product development;<\/span><\/li>\n<li><span style=\"color: #333333;\">delays and changes in requirements entail additional costs.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h2><span style=\"color: #000000;\">Agile Model<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">This is a set of different approaches to software development. These approaches are focused on the use of the iterative development<\/span> (<a href=\"https:\/\/intexsoft.com\/blog\/scrum-lifecycle-the-incremental-approach\/\">iterations are called sprints in Scrum<\/a>),<span style=\"color: #333333;\"> the dynamic formation of requirements and ensuring their implementation because of constant interaction within self-organizing working groups. Such groups mainly consist of specialists in various fields. Each individual iteration is a miniature software project. One of the main ideas of Agile is flexibility and interaction both within the team and personally with the customer.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">The development process for the classic Agile methodology is as follows:<\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7646\" src=\"https:\/\/www.intexsoft.com\/app\/uploads\/2021\/08\/agile-model.jpg\" alt=\"\" width=\"1000\" height=\"662\" srcset=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/agile-model.jpg 1000w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/agile-model-300x199.jpg 300w, https:\/\/intexsoft.com\/app\/uploads\/2021\/08\/agile-model-768x508.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/>The workflow in Agile<\/p>\n<p>&nbsp;<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #000000;\">Pros and Cons of Agile<\/span><\/h3>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Pros:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">fast decision making as the model involves constant communication and quick response;<\/span><\/li>\n<li><span style=\"color: #333333;\">flexibility;<\/span><\/li>\n<li><span style=\"color: #333333;\">minimal risks;<\/span><\/li>\n<li><span style=\"color: #333333;\">less paperwork.<\/span><\/li>\n<\/ul>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">Cons:<\/span><\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><span style=\"color: #333333;\">lots of meetings may slow down the development process;<\/span><\/li>\n<li><span style=\"color: #333333;\">It is difficult to get the processes going due to frequent changes in requirements.<\/span><\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><span style=\"color: #333333;\">In modern practice, there is a bigger variety of software development models, which we will tell you about in our future articles. To sum everything up, we can say that there is no one and only model for all projects. Methodologies overlap in terms of resources and are partially similar to each other. In order to make the right choice, it is necessary to take into account the project requirements, funding opportunities, time frames, etc.<\/span><\/p>\n\n\t\t<\/div>\n\t<\/section>\n\n\n\n<section id=\"\" class=\"authors \">\n\t\t<div class=\"content\">\n\t\t\t<div class=\"authors-container\">\n\t\t\t\t\t\t\t\t\t<h3 class=\"authors-title\">Written by<\/h3>\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"authors-info\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"author\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"author-photo\">\n\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/intexsoft.com\/app\/uploads\/2021\/07\/825E8D50-CC0F-46FF-BC64-C4ED5F9B3E1A.jpg\" loading=\"lazy\" alt=\"image\">\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"author-info\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<h4 class=\"author-fullname\"> Alexandra<\/h4>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"author-position text-tn\"> Marketing 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