{"id":2660,"date":"2025-06-24T09:40:33","date_gmt":"2025-06-24T13:40:33","guid":{"rendered":"https:\/\/a2la.org\/?p=2660"},"modified":"2025-08-14T11:36:01","modified_gmt":"2025-08-14T15:36:01","slug":"root-cause-analysis-methods","status":"publish","type":"post","link":"https:\/\/a2la.org\/root-cause-analysis-methods\/","title":{"rendered":"Root Cause Analysis Methods"},"content":{"rendered":"<p><span data-contrast=\"none\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-2665\" src=\"https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/A2LA-Employee-Photo-Jaik-Thompson.png\" alt=\"\" width=\"250\" height=\"250\" srcset=\"https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/A2LA-Employee-Photo-Jaik-Thompson.png 1200w, https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/A2LA-Employee-Photo-Jaik-Thompson-300x300.png 300w, https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/A2LA-Employee-Photo-Jaik-Thompson-1024x1024.png 1024w, https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/A2LA-Employee-Photo-Jaik-Thompson-150x150.png 150w, https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/A2LA-Employee-Photo-Jaik-Thompson-768x768.png 768w\" sizes=\"auto, (max-width: 250px) 100vw, 250px\" \/>Determining the root cause of a nonconformity is commonly referred to as root cause analysis (RCA). A root cause analysis is an important tool for continuous improvement and can be both the most challenging and the most essential part of the corrective action process.\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">The purpose of a root cause analysis is to mitigate future nonconformities. Understanding why an event occurred is the key to developing effective corrective actions. In some cases, the root cause is singular and easily discerned; in many cases it is not, and there may be multiple root causes. Because of this, there is no \u2018one size fits all\u2019 approach.\u00a0<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:240}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">Below are some common root cause analysis tactics which can be employed to address two questions: \u201c<\/span><i><span data-contrast=\"none\">Why did this nonconformity occur?<\/span><\/i><span data-contrast=\"none\">\u201d and \u201c<\/span><i><span data-contrast=\"none\">How can this nonconformity be prevented moving forward?<\/span><\/i><span data-contrast=\"none\">\u201d It is important to keep in mind when answering these questions that the corrective action shall be intended to eliminate the root cause(s) of the nonconformity, so that it does not recur or occur elsewhere.<\/span><span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:0,&quot;335559740&quot;:240}\">\u00a0<\/span><\/p>\n<h2>Fishbone Diagram<\/h2>\n<h3><span class=\"TextRun SCXW88699157 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW88699157 BCX0\">What is a Fishbone Diagram<\/span><span class=\"NormalTextRun SCXW88699157 BCX0\">?<\/span><\/span><span class=\"EOP SCXW88699157 BCX0\" data-ccp-props=\"{}\">\u00a0<\/span><\/h3>\n<p><span class=\"TextRun SCXW122775855 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW122775855 BCX0\">A fishbone diagram is a<\/span><span class=\"NormalTextRun SCXW122775855 BCX0\"> problem-solving tool <\/span><span class=\"NormalTextRun SCXW122775855 BCX0\">utilized<\/span><span class=\"NormalTextRun SCXW122775855 BCX0\"> by an individual or organization <\/span><span class=\"NormalTextRun SCXW122775855 BCX0\">that<\/span> <span class=\"NormalTextRun SCXW122775855 BCX0\">provides<\/span> <span class=\"NormalTextRun SCXW122775855 BCX0\">an <\/span><span class=\"NormalTextRun SCXW122775855 BCX0\">opportunity to <\/span><span class=\"NormalTextRun SCXW122775855 BCX0\">identify<\/span><span class=\"NormalTextRun SCXW122775855 BCX0\"> the root cause(s) of a problem, rather than the contributing factors. This tool is often used with the <\/span><\/span><a class=\"Hyperlink SCXW122775855 BCX0\" href=\"https:\/\/a2la.org\/the-5-whys-finding-causes-of-non-conformities\/\" target=\"_blank\" rel=\"noreferrer noopener\"><span class=\"TextRun Underlined SCXW122775855 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW122775855 BCX0\" data-ccp-charstyle=\"Hyperlink\">\u2018<\/span><span class=\"NormalTextRun SCXW122775855 BCX0\" data-ccp-charstyle=\"Hyperlink\">5 Whys<\/span><span class=\"NormalTextRun SCXW122775855 BCX0\" data-ccp-charstyle=\"Hyperlink\">\u2019<\/span><span class=\"NormalTextRun SCXW122775855 BCX0\" data-ccp-charstyle=\"Hyperlink\"> problem-solving tool<\/span><\/span><\/a><span class=\"TextRun SCXW122775855 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW122775855 BCX0\">.<\/span><\/span><span class=\"EOP SCXW122775855 BCX0\" data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h3><span class=\"TextRun SCXW29442716 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW29442716 BCX0\">Components of a Fishbone Diagram<\/span><\/span><\/h3>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"8\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:360,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><strong><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-2661 size-full\" style=\"font-weight: 400;\" src=\"https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/fishbone-diagram.png\" alt=\"\" width=\"549\" height=\"265\" srcset=\"https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/fishbone-diagram.png 549w, https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/fishbone-diagram-300x145.png 300w\" sizes=\"auto, (max-width: 549px) 100vw, 549px\" \/>Problem Statement<\/strong> \u2013 identifies an issue within a process or procedure<\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"8\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:360,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"2\" data-aria-level=\"1\"><strong>Categories<\/strong> \u2013 the major or most obvious influences that affect your process or procedure; the main \u201cribs\u201d of the diagram<\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"8\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:360,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><strong>Contributing Factors<\/strong> \u2013 incorporates the use of the 5 Whys to help evaluate the potential root causes; the \u201cribs\u201d of your categories<\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"8\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:360,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"4\" data-aria-level=\"1\"><strong>Additional Factors<\/strong> \u2013 utilized on an as-needed basis; provide deeper insight into the causes of your contributing factors; the \u201cribs\u201d of your contributing factors<\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"8\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:360,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"5\" data-aria-level=\"1\"><strong>Root Cause<\/strong> \u2013 determines which contributing factor most influences the problem statement and provides explanation as to why an issue may be occurring<\/li>\n<\/ul>\n<h3><span class=\"TextRun SCXW193200818 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW193200818 BCX0\">Drawing Conclusions from the Fishbone Diagram<\/span><\/span><\/h3>\n<p><span class=\"TextRun SCXW19471708 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW19471708 BCX0\">When all brainstorming has been completed, the fishbone diagram is analyzed to <\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">determine<\/span><span class=\"NormalTextRun SCXW19471708 BCX0\"> any recurring causes between categories. These recurring causes are a good <\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">indication<\/span><span class=\"NormalTextRun SCXW19471708 BCX0\"> of the overall root cause and should be reviewed closely. If no recurring causes are present, team members should <\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">collaborate to <\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">determine<\/span><span class=\"NormalTextRun SCXW19471708 BCX0\"> which causes are the most influential to the problem. Once these causes are <\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">identified<\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">, collaborate further until an agreed root cause is <\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">identified<\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">. Once a root cause is <\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">identified<\/span><span class=\"NormalTextRun SCXW19471708 BCX0\">, changes to a process or procedure can be put in place to prevent the issue from occurring<\/span><span class=\"NormalTextRun SCXW19471708 BCX0\"> again<\/span><span class=\"NormalTextRun SCXW19471708 BCX0\"> in the future.<\/span><\/span><span class=\"EOP SCXW19471708 BCX0\" data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<h2><span class=\"TextRun SCXW79742497 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW79742497 BCX0\">Fault Tree Analysis<\/span><span class=\"NormalTextRun SCXW79742497 BCX0\"> (FTA)<\/span><\/span><\/h2>\n<h3><span class=\"TextRun SCXW188338064 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW188338064 BCX0\">What is <\/span><span class=\"NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW188338064 BCX0\">a Fault<\/span><span class=\"NormalTextRun SCXW188338064 BCX0\"> Tree Analysis (FTA)<\/span><span class=\"NormalTextRun SCXW188338064 BCX0\">?<\/span><\/span><span class=\"LineBreakBlob BlobObject DragDrop SCXW188338064 BCX0\"><br class=\"SCXW188338064 BCX0\" \/><\/span><\/h3>\n<p><span class=\"NormalTextRun SCXW188338064 BCX0\">FTA is<\/span><span class=\"NormalTextRun SCXW188338064 BCX0\"> a problem-solving technique<\/span><span class=\"NormalTextRun SCXW188338064 BCX0\"> used to ensure all factors contributing to a nonconformance are thoroughly reviewed. <\/span><span class=\"NormalTextRun SCXW188338064 BCX0\">This can help the laboratory understand and address <\/span><span class=\"NormalTextRun SCXW188338064 BCX0\">multiple <\/span><span class=\"NormalTextRun SCXW188338064 BCX0\">potential causes of errors or failures that could affect the quality and reliability of test results, compliance with standards, or the overall functioning of the lab.<\/span> <span class=\"NormalTextRun SCXW188338064 BCX0\">This technique may be ideal when a problem has multiple contributing causes.<\/span><span class=\"NormalTextRun SCXW188338064 BCX0\"> It is also useful for complex systems, safety-critical systems<\/span><span class=\"NormalTextRun SCXW188338064 BCX0\">,<\/span><span class=\"NormalTextRun SCXW188338064 BCX0\"> and evaluating interactions.<\/span><\/p>\n<h3><span class=\"TextRun SCXW133866031 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW133866031 BCX0\">Components of a Fault Tree Analysis (FTA)<\/span><\/span><\/h3>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><span data-contrast=\"auto\"><strong><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-2662\" src=\"https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/fault-tree-diagram.png\" alt=\"\" width=\"500\" height=\"286\" \/>Layer 1<\/strong> &#8211; <\/span><span data-contrast=\"auto\">Define the \u201ctop event\u201d or primary failure to be analyzed. This could be failure of a PT test, noncompliance with a specific standard\/clause, or failure to maintain equipment in a proper manner.<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"2\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"2\" data-aria-level=\"1\"><strong>Layer 2 <\/strong><span data-contrast=\"auto\">&#8211; Construct the second layer of the Fault Tree or graphical representation of all possible contributing causes that could lead to the top event.\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"4\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><strong>Layer 3 and beyond <\/strong><span data-contrast=\"auto\">&#8211; From the second layer, determine a third layer of cause analysis as shown below \u2013 this tree can be continued for multiple additional layers until the root of the problem is discovered, and should include at least three layers.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<h3><span class=\"TextRun SCXW254437994 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"none\"><span class=\"NormalTextRun SCXW254437994 BCX0\">Drawing Conclusions from the Fault Tree<\/span><\/span><\/h3>\n<p><span class=\"TextRun SCXW218591338 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW218591338 BCX0\">Once the fault tree is constructed, it is essential to assess and evaluate each cause in the tree. <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">It is important to remember that there may be both primary and secondary causes stemming from one or more of the branc<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">h<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">es<\/span> <span class=\"NormalTextRun SCXW218591338 BCX0\">(causes)<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">. <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">All primary and secondary<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> causes should <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">be evaluated<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> for risks and prioritized to <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">determine<\/span> <span class=\"NormalTextRun SCXW218591338 BCX0\">wh<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">ich<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">\/when<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> corrective actions should be taken. <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">To <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">determine<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> the main root cause<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> in the FTA<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">, <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">identify<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> the most critical<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> path <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">of nonsuccess<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> and prioritize the corrective actions that <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">solve<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> the highest priority <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">issue<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">.<\/span> <span class=\"NormalTextRun SCXW218591338 BCX0\">After implementation, <\/span><span class=\"NormalTextRun ContextualSpellingAndGrammarErrorV2Themed SCXW218591338 BCX0\">the corrective<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> actions should be <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">monitored<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> and verified to ensure <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">they are<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> successful. All corrective actions and document<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">s<\/span> <span class=\"NormalTextRun SCXW218591338 BCX0\">pertaining to<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> the FTA should be <\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">retained<\/span> <span class=\"NormalTextRun SCXW218591338 BCX0\">for continuous improvement<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\"> and record retention<\/span><span class=\"NormalTextRun SCXW218591338 BCX0\">.<\/span><\/span><\/p>\n<h2>5 Whys<\/h2>\n<h3><span class=\"NormalTextRun SCXW232417366 BCX0\">What is a <\/span><span class=\"NormalTextRun SCXW232417366 BCX0\">5<\/span> <span class=\"NormalTextRun SCXW232417366 BCX0\">Whys<\/span><span class=\"NormalTextRun SCXW232417366 BCX0\"> analysis<\/span><span class=\"NormalTextRun SCXW232417366 BCX0\">?<\/span><\/h3>\n<p><span data-contrast=\"auto\">The 5 Whys is a tactic that can be employed by individuals and organizations as a starting place to determine the root cause for when a simple problem or a problem which is likely to have one root cause occurs. The steps are outlined below and begin with identifying the problem. \u2018Embrace your inner toddler and keep asking why.\u2019\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"auto\">This tactic provides limited information for the cause of multiplex problems with multiple independent contributing factors, however, can be critical when one variable leads to a nonconformance which is far-removed in location or time from the surveyor. While the number 5 is traditionally used, this could be simplified or extended<\/span><span data-contrast=\"none\">. The 5 Why approach is mirrored and extended within the other tactics listed here.<\/span><\/p>\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-2664\" src=\"https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/5-whys-1-e1750771241533.png\" alt=\"\" width=\"500\" height=\"359\" srcset=\"https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/5-whys-1-e1750771241533.png 507w, https:\/\/a2la.org\/wp-content\/uploads\/2025\/06\/5-whys-1-e1750771241533-300x215.png 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/>Components of a Five Whys<\/h3>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"1\" data-aria-level=\"1\"><strong>Problem Statement<\/strong><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"2\" data-aria-level=\"1\"><span data-contrast=\"none\"><strong>First Why<\/strong> \u2013 Why is there a puddle of water on the floor?<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"3\" data-aria-level=\"1\"><span data-contrast=\"none\"><strong>Second Why<\/strong> \u2013 Why is the overhead pike leaking?<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"4\" data-aria-level=\"1\"><span data-contrast=\"none\"><strong>Third Why<\/strong> \u2013 Why is there too much water pressure in the pipe?<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"5\" data-aria-level=\"1\"><span data-contrast=\"none\"><strong>Fourth Why<\/strong> \u2013 Why is there a faulty control valve?<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"6\" data-aria-level=\"1\"><span data-contrast=\"none\"><strong>Fifth Why<\/strong> \u2013 Why have the control valves not been tested?<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<ul>\n<li data-leveltext=\"\uf0b7\" data-font=\"Symbol\" data-listid=\"5\" data-list-defn-props=\"{&quot;335552541&quot;:1,&quot;335559685&quot;:720,&quot;335559991&quot;:360,&quot;469769226&quot;:&quot;Symbol&quot;,&quot;469769242&quot;:[8226],&quot;469777803&quot;:&quot;left&quot;,&quot;469777804&quot;:&quot;\uf0b7&quot;,&quot;469777815&quot;:&quot;hybridMultilevel&quot;}\" aria-setsize=\"-1\" data-aria-posinset=\"7\" data-aria-level=\"1\"><span data-contrast=\"none\"><strong>Final Root Cause<\/strong> \u2013 Control valves are not on maintenance schedule<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/li>\n<\/ul>\n<h3><span class=\"NormalTextRun SCXW222426754 BCX0\">Drawing Conclusions <\/span><span class=\"NormalTextRun SCXW222426754 BCX0\">from the <\/span><span class=\"NormalTextRun SCXW222426754 BCX0\">5<\/span> <span class=\"NormalTextRun SCXW222426754 BCX0\">Whys<\/span><\/h3>\n<p><span data-contrast=\"none\">The conclusion is drawn after the final why is answered. To check that the root cause has been determined, ask yourself \u2018if this final event had been addressed, would the entire nonconformity not have occurred?\u2019 The answer should be yes. It is helpful at this stage to ask if any similar issues have occurred. For the example above, is there any other essential equipment which are not properly maintained on this schedule? This may help to identify and mitigate similar nonconformities.\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">Each of these techniques can be used to identify the source or sources of a problem prior to determining the action(s) to be taken. Remember, the corrective action implemented should address the root cause directly even when it appears to be potentially unrelated. For example, a problem with equipment might have a root cause which is related to insufficient training. In this example, the insufficient training should be addressed within the corrective action. This will prevent the problem from recurring.<\/span><b><span data-contrast=\"none\">\u00a0<\/span><\/b><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">An easy mistake to make is restating the nonconformity as the root cause statement. For example, for a nonconformity \u2018Laboratory Management Review did not include an input of complaints,\u2019 a restatement type root cause might be \u2018Laboratory Management failed to include complaints as an input to the Management Review.\u2019 This example statement does not provide insight as to why the problem occurred.\u00a0<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p><span data-contrast=\"none\">Some organizations may also misstep by oversimplifying or conversely overcomplicating the root cause analysis by either attributing one root cause to multiple issues (which stem from multiple causes) or conversely allocating significant time and resources to investigate and correct for a simple and preventable mistake. To simplify the process, each nonconformance should be evaluated independently, even in cases where one root cause results in multiple nonconformances. Taking this approach will make it easier to spot trends in the <\/span><span data-contrast=\"none\">identified root causes for a group of nonconformances. For example, upon conclusion of an assessment during which 8 nonconformances were cited, it is determined that the root cause of 6 of the 8 nonconformances pertain to employee training. In this example, additional investigation into the employee training program would be prudent and should be evident in a response.<\/span><span data-ccp-props=\"{}\">\u00a0<\/span><\/p>\n<p>Take the first step in building quality and confidence in your organization.\u00a0<a href=\"https:\/\/a2la.org\/estimate-request\/\">Click here to request an estimate<\/a>. For more information about accreditation, contact A2LA at\u00a0<a href=\"mailto:info@A2LA.org\">info@A2LA.org<\/a>\u00a0or call 301-644-3248.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding why an event occurred is the key to developing effective corrective actions. Explore root cause analysis methods.<br \/><a class=\"read-more blog-read-more\" href=\"https:\/\/a2la.org\/root-cause-analysis-methods\/\">Read More<i class=\"fas fa-arrow-right ml-2\"><\/i><\/a><\/p>\n","protected":false},"author":59,"featured_media":2666,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[191],"tags":[192,111,189,229,228],"class_list":{"0":"post-2660","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-accreditation","8":"tag-a2la","9":"tag-accreditation","10":"tag-accreditation-body","11":"tag-cause-analysis","12":"tag-root-cause-analysis","13":"entry"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.3.1 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Root Cause Analysis Methods | A2LA<\/title>\n<meta name=\"description\" content=\"Understanding why an event occurred is the key to developing effective corrective actions. 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