{"id":17009,"date":"2018-07-22T20:21:22","date_gmt":"2018-07-22T17:21:22","guid":{"rendered":"https:\/\/www.intellectsoft.net\/blog\/?p=17009"},"modified":"2023-01-18T16:54:24","modified_gmt":"2023-01-18T13:54:24","slug":"regression-testing","status":"publish","type":"post","link":"https:\/\/www.intellectsoft.net\/blog\/regression-testing\/","title":{"rendered":"Basic Guide: Regression Testing"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">The success of any software or application lies in how well the developers maintain it. To ensure efficient software performance, developers keep rolling out various updates regularly. These changes may sometimes interfere with existing software functions, affecting the overall performance and frustrating end users.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To avoid this, developers conduct a performance review with different QA (Quality Assurance) testing procedures after making such changes. One of them is <\/span><span style=\"font-weight: 400;\">regression testing<\/span><span style=\"font-weight: 400;\">.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Our guide will cover the following:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">What is regression testing<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Types of RT<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Factors Different RT Strategies Rely On<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Regression testing techniques<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Ho to perform regression testing<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Regression testing project statistics<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Regression testing tools<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Best RT practices<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Examples of RT<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Difference between RT and retesting<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Let\u2019s start.<\/span><\/p>\n<h2><b>What Is Regression Testing<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">In software testing, <\/span><i><span style=\"font-weight: 400;\">regression<\/span><\/i><span style=\"font-weight: 400;\"> indicates any unintended change or deviation from the usual performance level following a software update from developers. For instance, any performance issue with software following a bug fix is a regression.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-17016\" src=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/what-is-regression-testing-1-1024x624.jpg\" alt=\"what is regression testing\" width=\"801\" height=\"488\" srcset=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/what-is-regression-testing-1.jpg 1024w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/what-is-regression-testing-1-300x183.jpg 300w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/what-is-regression-testing-1-768x468.jpg 768w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/what-is-regression-testing-1-600x366.jpg 600w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/what-is-regression-testing-1-450x274.jpg 450w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/what-is-regression-testing-1-1000x609.jpg 1000w\" sizes=\"auto, (max-width: 801px) 100vw, 801px\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Hence, the <\/span><span style=\"font-weight: 400;\">regression testing meaning<\/span><span style=\"font-weight: 400;\"> denotes an inclusive testing methodology that helps to reveal regression in software. More specifically, the procedure regression testing helps QA experts identify and rectify any glitches that may arise after bug fixes, performance improvements, or feature upgrades in software prior to its release.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">During regression testing, previous tests are re-performed to validate proper functioning of some or all of software features, including the ones were not changed. QA experts do this to ensure that new code does not negatively affect the old one in any way.<\/span><\/p>\n<h2><b>Types Of Regression Testing<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">As evident from the <\/span><span style=\"font-weight: 400;\">regression testing definition<\/span><span style=\"font-weight: 400;\">, the procedure cover a lot of ground when it comes to reviewing and testing software. Depending upon the changes made and expected results, developers conduct different of regression testing.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The ultimate goal behind every type is to ensure the released software works efficiently. Therefore, it is important to choose the right type of regression testing before planning the product release.\u00a0<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-17017\" src=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/types-of-regression-testing-1.png\" alt=\"types of regression testing\" width=\"505\" height=\"548\" srcset=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/types-of-regression-testing-1.png 505w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/types-of-regression-testing-1-276x300.png 276w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/types-of-regression-testing-1-415x450.png 415w\" sizes=\"auto, (max-width: 505px) 100vw, 505px\" \/><\/p>\n<p style=\"text-align: center;\"><i><span style=\"font-weight: 400;\">Different Types of Regression Testing<\/span><\/i><\/p>\n<p><span style=\"font-weight: 400;\">Let\u2019s go through the types of regression testing.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">1) Corrective Testing<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Corrective testing is performed by reusing the existing test cases when no changes are made in the product.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">2) Selective Testing<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">When new code is added, then selective testing is performed by using a subset of existing test cases. It is a cost-effective <\/span><span style=\"font-weight: 400;\">regression testing<\/span><span style=\"font-weight: 400;\"> approach that requires fewer efforts from QA experts.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">3)Progressive Testing<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Progressive testing is performed when software gets an update. It helps to ensure that existing features are not affected or compromised by the update.\u00a0 To achieve that, QA experts create new test case scenarios.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">4) Unit Testing<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Unit testing is used to test a specific code unit separately by blocking all interactions and dependencies prior to testing.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">5) Complete Testing<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">When software receives a major update to the existing code, then complete regression testing is required to validate its performance. This approach involves comprehensive retesting to spot any bugs that can arise as a result. Complete regression testing also ensures root code is not afffected.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Factors Different <\/span><span style=\"font-weight: 400;\">Regression Testing Strategies <\/span><span style=\"font-weight: 400;\">Rely On<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Choosing the right <\/span><span style=\"font-weight: 400;\">regression testing<\/span><span style=\"font-weight: 400;\"> strategy is key in achieving error-free software performance after an update, so you need to consider a number of factors in the process of creating yours:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><b>Nature of Product. <\/b><span style=\"font-weight: 400;\">To choose a fitting regression testing type, you need to consider the nature of your product first. A technique that works best to retest a website may not be suitable for testing a mobile application.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Scale of Product.<\/b><span style=\"font-weight: 400;\"> Your choice of the right software testing technique also depends on the complexity of your product. Small projects may only require one testing technique, while more complex software solutions may need multiple testing methods. Everything depends both on the scale of the product and changes made to it.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Testing Method. <\/b><span style=\"font-weight: 400;\">Depending on the product, QA experts can choose either manual testing, automated testing, or both. While manual regression testing works best during the first phases of software development cycle, it is a time-consuming procedure that requires a lot of resources. Automated testing, on the other hand, simplifies the process, saving time and efforts. QA automation involves the use of dedicated QA tools (we will discuss them further).<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Testing Type.<\/b><span style=\"font-weight: 400;\"> Based on the nature of changes and the product, the developers can choose either partial or complete regression testing for a product.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Quality Testing Suite.<\/b><span style=\"font-weight: 400;\"> Choosing a quality testing suite is also highly important. QA experts can use functional and non-functional test cases that cover all the features receiving updates in later stages of software development process.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Regression Testing<\/span><span style=\"font-weight: 400;\"> Techniques<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">There are three software regression testing techniques. Still, more are emerging from them to cover the needs of different projects.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-17018\" src=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/how-to-do-regression-testing-1.png\" alt=\"how to do regression testing\" width=\"928\" height=\"523\" srcset=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/how-to-do-regression-testing-1.png 928w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/how-to-do-regression-testing-1-300x169.png 300w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/how-to-do-regression-testing-1-768x433.png 768w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/how-to-do-regression-testing-1-600x338.png 600w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/how-to-do-regression-testing-1-450x254.png 450w\" sizes=\"auto, (max-width: 928px) 100vw, 928px\" \/><\/p>\n<p style=\"text-align: center;\"><i><span style=\"font-weight: 400;\">Regression Testing Techniques<\/span><\/i><\/p>\n<h3><span style=\"font-weight: 400;\">1. Retest-all<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">This technique involves re-conducting all the test cases to ensure the absence of any bugs that may arise after changes to code have been made. Despite being useful, this technique demands more costs, time, and other resources.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">2. Regression Test Selection<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Based on changes to code, QA experts select only some test cases from the test suite instead of re-executing all cases.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This technique divides test cases into <\/span><b>reusable <\/b><span style=\"font-weight: 400;\">(can be used in future regression testing cycles) and <\/span><b>obsolete<\/b><span style=\"font-weight: 400;\">. Despite the name, obsolete test cases may sometimes prove useful in future versions of a product.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">3. Test Case Prioritization<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">This technique prioritizes test cases for re-execution considering the importance of cases, their potential impact on the product, and the frequency of use.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Hybrid<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Hybrid <\/span><span style=\"font-weight: 400;\">regression testing<\/span><span style=\"font-weight: 400;\"> combines test selection and test case prioritization techniques. Here, the selected test cases from a test suite are prioritized for re-execution.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">How To Do Regression Testing<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Regardless of the technique you choose for <\/span><span style=\"font-weight: 400;\">regression testing<\/span><span style=\"font-weight: 400;\">, they all have the same process. Let\u2019s explore it step-by-step.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-17019\" src=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-definition.png\" alt=\"regression testing definition\" width=\"800\" height=\"460\" srcset=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-definition.png 948w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-definition-300x172.png 300w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-definition-768x442.png 768w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-definition-600x345.png 600w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-definition-450x259.png 450w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/p>\n<p style=\"text-align: center;\"><i><span style=\"font-weight: 400;\">Performing Regression Testing<\/span><\/i><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><b>Identify the need: <\/b><span style=\"font-weight: 400;\">After the software development phase is over, testing is carried out to address bug fixes, address performance issues, and other.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Set test requirements:<\/b><span style=\"font-weight: 400;\"> Based on the aim of testing and unit where it is required, QA experts create test conditions for regression testing.<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Determine the starting point:<\/b><span style=\"font-weight: 400;\"> With requirements at hand, QA experts choose where to start testing.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><b>Determine endpoint:<\/b><span style=\"font-weight: 400;\"> Planning is key, so QA experts also choose an endpoint for their testing efforts, which depends on requirements and the aim of their testing process.<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Regression Testing Statistics<\/span><span style=\"font-weight: 400;\"> on Software Changes<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">With every new change to the product and every new regression cycle, the number of test cases for future regression cycles changes (see the charts below). The testing process becomes more difficult, time-consuming, and costly. QA experts can deselect the test cases that no more remain useful to smooth out the execution of future regression cycles.<\/span><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-17020\" src=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-statistics-1024x474.png\" alt=\"regression testing statistics\" width=\"1024\" height=\"474\" srcset=\"https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-statistics-1024x474.png 1024w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-statistics-300x139.png 300w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-statistics-768x355.png 768w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-statistics-600x278.png 600w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-statistics-450x208.png 450w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-statistics-1000x463.png 1000w, https:\/\/www.intellectsoft.net\/blog\/wp-content\/uploads\/regression-testing-statistics.png 1236w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/p>\n<p style=\"text-align: center;\"><i><span style=\"font-weight: 400;\">Source: Ranorex<\/span><\/i><\/p>\n<h2><span style=\"font-weight: 400;\">Regression Testing Tools<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Automated <\/span><span style=\"font-weight: 400;\">regression testing<\/span><span style=\"font-weight: 400;\"> is a convenient alternative to manual testing, more so if software is updated frequently. With dedicated regression testing tools, automated testing has become much easier, quicker, and cost-effective.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here are some of the most-used tools for automated software testing.<\/span><\/p>\n<p><b>Ranorex Studio<\/b><span style=\"font-weight: 400;\">. A comprehensive automated testing tool for web, desktop, and mobile applications; offers built-in Selenium WebDriver and supports codeless automation with IDE plus tools.<\/span><\/p>\n<p><b>Selenium<\/b><span style=\"font-weight: 400;\">. An open-source tool for browser-based regression tests; primarily aims at web apps automation.\u00a0<\/span><\/p>\n<p><b>Micro Focus UFT<\/b><span style=\"font-weight: 400;\"> (Unified Functional Testing). Known as HP Quick Test Professional (QTP), the tool uses VBScript language to help automate functional and regression tests for software apps and environments.\u00a0<\/span><\/p>\n<p><b>IBM Rational Functional Tester<\/b><span style=\"font-weight: 400;\"> (RFT). The tool provides functional, regression, data-driven, and GUI (Graphical User Interface) testing automation for various applications.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Other <\/span><span style=\"font-weight: 400;\">Regression Testing Software<\/span><\/h3>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">SahiPro<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">TestDrive<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">TimeShiftX<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Serenity<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Watir<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Test Complete<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">AdventNet QEngine<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">TestingWhiz<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Silktest<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">QA Wizard Pro<\/span><\/li>\n<\/ul>\n<h2><span style=\"font-weight: 400;\">Regression Testing Best Practices<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">If you are a QA engineer, it is highly important for you to comply with the best practices for <\/span><span style=\"font-weight: 400;\">regression testing<\/span><span style=\"font-weight: 400;\">. Here is a quick overview of what to consider in your testing process.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Save time and resources by relying more on automation testing.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">As new test cases are added with each update, always keep the <\/span><i><span style=\"font-weight: 400;\">regression pack <\/span><\/i><span style=\"font-weight: 400;\">(a set of regression test cases) up-to-date.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">When you test, the main focus should be on software\u2019s core functionality and the most popular features. Also, double-check if the test cases for these are in the regression pack and are up-to-date.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Re-execute successful test cases, that is, the ones that previously spotted bugs successfully.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">On top of that, it is better to create a dedicated policy for regression testing that accounts for product requirements and risk factors of a client\u2019s business.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Regression Testing Examples<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The process of <\/span><span style=\"font-weight: 400;\">regression testing<\/span><span style=\"font-weight: 400;\"> is highly elaborate, but also very important. From minor bug fixes to feature upgrades and improvements, every successful software has QA specialists experienced in regression testing behind it.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here is an example of regression testing:<\/span><\/p>\n<p><iframe loading=\"lazy\" title=\"What is Regression Testing? Software Testing Tutorial\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/aeu5zacsHsI?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><\/p>\n<h2><span style=\"font-weight: 400;\">Difference Between Retesting And Regression Testing<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Although the concepts of regression testing and retesting in software development may look similar on paper, they differ in practice.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Regression testing<\/span><span style=\"font-weight: 400;\"> primarily refers to a testing procedure QA experts perform to detect bugs that may appear after code is changed. Regression testing ensures the changes do not affect existing functionality of software. Meanwhile, retesting is when QA experts re-execute tests after bug fixes to ensure the issue is removed.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Conclusion<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Maintenance is the longest phase in the software development lifecycle. It starts after software is deployed and continues to the moment it is no more. For the most part, the success of this stage rests upon regression testing, as it ensures continuous and bug-free operation of software and successful updates to its existing functionality. Thanks to many automation tools for regression testing available, QA experts can perform easier, faster, and using less resources. Except that and the level of expertise of a QA expert, successful regression relies on a number of important guidelines, tried-and-true guidelines, and choosing a fitting automation tool for a given project.\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Including types, best practices, most popular tools, and more.<\/p>\n","protected":false},"author":25,"featured_media":17012,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-17009","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-community"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>A Brief Overview Of Software Regression Testing | Intellectsoft<\/title>\n<meta name=\"description\" content=\"From regression testing types to best practices 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