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5Why and 5W2H are both used in problem solving techniques, but they are different in terms of their purpose and phases where they are used in problem solving work flow. * Over all understanding of these tool - 5W2H - It is a tool used in problem definition analysis, wherein multiple guiding questions like What, Where, When, Who, Why, How and How-much, are asked to gather all relevant information of problem. With this information team can see the exact nature of problem, and can then state it in precise terms. It is kind of problem assessment tool. 5Why - It is tool used in Root cause analysis. It is a series of interlinked "Why" questions asked one after another to reach to root of problem from symptoms of the problem. It gives team a chance to act upon a right & deeper cause, which will solve the problem from its re-occurrence instead of only surface actions * Purpose - 5W2H - To find out all important information about a problem so that SMART defination of a problem can be made. To define what is problem, and what is not problem. To limit the scope of problem solving. To get 360 degree view of the problem. 5Why - To find out the exact root 'cuase' of 'problem' by finding the exact chain of relationship between them To solve the problem permanently from its roots To eliminate the re-occurrence of problem * Where to use it - 5W2H -It is generally used at the start of problem solving in "Define" phase of problem solving work flow or a DMAIC six sigma project, while forming the 'problem statement' in that phase. It problem is well defined considering all directions, If problem is well understood by the team then, problem is half solved, means team will properly direct their next steps. 5Why - 5Why is used generally at the "Analysis" phase of problem solving work flor or a DMAIC six sigma project, while forming the 'problem statement' in that phase. * How to use it - Examples 5W2H - What - What is the problem? - Operator got injured on shop floor Where - Where is the problem? - In machine shop near machine number 4 & 5 When - When is the problem? - 2 Accidents happened in multiple shifts (1st shift as well as 3rd) in last 8 days Who- Who is involved in the problem phenomenon? - 2 machine operators working on machine were the affected persons, one slipped and injured, another slipped but did not got injured Why is the problem - probably floor conditions are not as per standard and slippages happening due to oil seen on shop floor as reported by shift supervisor How - How is problem happening? While working on machine operator has to take few steps to pick the parts and while doing it, he slipped down and got the elbow injury on right hand, in second case operator slipped but did not got injury How-much - How many incidences? there are total 2 incidences reported in last 8 days 5Why - 1 Why - Why we see this as a problem - Because one machine operator got injured which is reportable safety issue 2 Why - (Why Machine operator got injured?) Because he slipped from slippery shop floor 3 Why - (Why he slipped from slippery shop floor?) Because shop floor has oil spillage, reported by supervisor 4 Why - (Why shop floor has oil spillage?) Because drain outlet seal of oil tank of machine has leakage, seen by team 5 Why - (Why drain outlet of oil tank of machine has leakage?) Because seal was not replace during preventive maintenance (PM), verified by team Like this we can go further deeper like "why seal is not replaced in PM - because it was not defined in PM checklist, etc ....And action (actionable/feasible/economical Action) should be taken on Root Cause which is the last Cause of this chain. ~ Vivek Dahake