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The answer is All-A, B, C, D, E, and F. Every RCA is practically a drill down exercise which means the necessity of the presence of sufficient triggers is responsible for the event to occur. Just like a pull system, only if 'An' is present will the consecutive step/activity be triggered. It is a chain of events which can be broken down only after removal/handling of the primary root cause. Regards, Dr. Bhamini Thukral

How To Compare Six Sigma, Lean and the Theory of Constraints A framework for choosing what is the best for your organization: First, identify the primary theory. What is the core emphasis of the program or methodology? This core emphasis is usually a few words or a short phrase: Six Sigma is variation reduction, lean’s is waste reduction and TOC is constraint reduction. Then identify the relationship between the primary theory and the primary focus of the tools and methodology. This relationship indicates how the primary theory manifests itself in tangible results. What I call the primary effect. This is an if/then type of relationship: For Six Sigma: If we focus on reducing variation, then we will have more uniform process output. For lean: If we focus on waste removal, then flow time will improve. For TOC: If we focus on constraints, then throughput volume will improve.

Sir,my answer is still option 6,all the causes are necessary & sufficient to explain their respective next step. Option 1 & 2 are not the strongest contenders. For eg. We have safeguarded our balcony by using pigeon protection net just to keep it clean,pigeons are still there but we have taken action for main cause i.e.pigeon poops.

All – A, B, C, D, E, and F

6th option

All A, B, C, D, E, and F

6. All – A, B, C, D, E, and F