{"id":423,"date":"2020-03-19T07:08:58","date_gmt":"2020-03-19T07:08:58","guid":{"rendered":"http:\/\/learnlearn.uk\/alevelcs\/?page_id=423"},"modified":"2023-06-04T09:19:10","modified_gmt":"2023-06-04T09:19:10","slug":"stepwise-refinement","status":"publish","type":"page","link":"https:\/\/learnlearn.uk\/alevelcs\/stepwise-refinement\/","title":{"rendered":"Stepwise Refinement"},"content":{"rendered":"<div class=\"responsive-tabs\">\n<h2 class=\"tabtitle\">Stepwise Refinement<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Stepwise Refinement<\/h3>\n<p>Stepwise Refinement is the process of breaking down a programming problem into a series of steps. You start with a general set of steps to solve the problem, defining each in turn. Once you have defined each of the steps you then break the problem down into a series of smaller sub-steps. Once this is complete you keep on going until you have described the problem in such a level of detail that you can code a solution to the problem.<\/p>\n<p>Stepwise refinement can be represented diagrammatically as such:<\/p>\n<p><a href=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/03\/stepwise-refinement-tutorial.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-429\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/03\/stepwise-refinement-tutorial.png\" alt=\"\" width=\"746\" height=\"462\" srcset=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/03\/stepwise-refinement-tutorial.png 746w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/03\/stepwise-refinement-tutorial-300x186.png 300w\" sizes=\"(max-width: 746px) 100vw, 746px\" \/><\/a><\/p>\n\n<\/div><h2 class=\"tabtitle\">Video Tutorial<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Video Tutorial<\/h3>\n<p><a href=\"https:\/\/drive.google.com\/file\/d\/1Noeg4xgFm4p7ecsw-v95LVmLa7IIkw0g\/view?usp=sharing\">YouTube blocked in School? Use the Google Drive version instead<\/a><\/p>\n<div class=\"nv-iframe-embed\">\n<div class=\"container-lazyload preview-lazyload container-youtube js-lazyload--not-loaded\"><a href=\"https:\/\/www.youtube.com\/watch?v=LcjGW9SUuV0\" class=\"lazy-load-youtube preview-lazyload preview-youtube\" data-video-title=\"Stepwise Refinement Tutorial\" title=\"Play video &quot;Stepwise Refinement Tutorial&quot;\">https:\/\/www.youtube.com\/watch?v=LcjGW9SUuV0<\/a><noscript>Video can&#8217;t be loaded because JavaScript is disabled: <a href=\"https:\/\/www.youtube.com\/watch?v=LcjGW9SUuV0\" title=\"Stepwise Refinement Tutorial\">Stepwise Refinement Tutorial (https:\/\/www.youtube.com\/watch?v=LcjGW9SUuV0)<\/a><\/noscript><\/div>\n<\/div>\n\n<\/div><h2 class=\"tabtitle\">Advantages &amp; Disadvantages<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Advantages of step-wise refinement<\/h3>\n<ul>\n<li>By breaking the problem down into steps it is easy to get\u00a0 good understanding of the scale of the problem. As a result less time and resources will be required to solve the problem.<\/li>\n<li>Many of the design decisions can be made during the stepwise refinement process, making it faster to make changes than after coding<\/li>\n<li>Large projects can be broken down and certain components issued to different developers.<\/li>\n<li>The overview makes the project easy to manage.<\/li>\n<\/ul>\n<h3>Disadvantages<\/h3>\n<ul>\n<li>Investigatory projects cannot always be developed from the top-design<\/li>\n<li>Stepwise refinement does not easily allow for projects to evolve during the development as a result of internal or external factors.<\/li>\n<\/ul>\n\n<\/div><h2 class=\"tabtitle\">Activity<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Activity : Going Food Shopping<\/h3>\n<p>Use Stepwise Refinement to break down the process of going food shopping into levels of detail until you would be able to write a &#8216;shopping algorithm&#8217;.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"size-medium wp-image-424 alignnone\" src=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/03\/shopping-cart-309592_640-300x270.png\" alt=\"\" width=\"300\" height=\"270\" srcset=\"https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/03\/shopping-cart-309592_640-300x270.png 300w, https:\/\/learnlearn.uk\/alevelcs\/wp-content\/uploads\/sites\/20\/2020\/03\/shopping-cart-309592_640.png 640w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n\n<\/div><h2 class=\"tabtitle\">Resources<\/h2>\n<div class=\"tabcontent\">\n\n<h3>Resources<\/h3>\n<p><a href=\"https:\/\/docs.google.com\/presentation\/d\/10Y6y5e4QzQ3WSkFGxU3qRaBWf0sghNtTqrKWjghYJWc\/edit?usp=sharing\">Google Slides Presentation<\/a><\/p>\n<p><a href=\"https:\/\/www.aicurriculum.co.uk\/resources\/1e410fce-84ae-43b6-bccf-c89b05886f9a\">Study &amp; Revision Resources<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<\/div><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stepwise Refinement Stepwise Refinement is the process of breaking down a programming problem into a series of steps. You start with a general set of steps to solve the problem, defining each in turn. Once you have defined each of the steps you then break the problem down into a series of smaller sub-steps. Once&hellip;&nbsp;<a href=\"https:\/\/learnlearn.uk\/alevelcs\/stepwise-refinement\/\" class=\"\" rel=\"bookmark\">Read More &raquo;<span class=\"screen-reader-text\">Stepwise Refinement<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"off","neve_meta_content_width":70,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Stepwise Refinement - A Level Computer Science<\/title>\n<meta name=\"description\" content=\"A beginner&#039;s introduction to stepwise refinement as covered by the CIE A Level course. Includes a definition, introductory video and supporting resources.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/learnlearn.uk\/alevelcs\/stepwise-refinement\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stepwise Refinement - A Level Computer Science\" \/>\n<meta property=\"og:description\" content=\"A beginner&#039;s introduction to stepwise refinement as covered by the CIE A Level course. 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You start with a general set of steps to solve the problem, defining each in turn. Once you have defined each of the steps you then break the problem down into a series of smaller sub-steps. 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