Cause and Effect Chain Analysis PDF

TMS/T/N 1003 SYSTEMATIC INNOVATION AND INNOVATIVE PROBLEM SOLVING Semester 1 2022/2023 TRIZ Tool : Cause & Effect Analysis Content What is Cause-and-Effect Analysis? Types of Cause-and-Effect Analysis How to use Cause-and-Effect Analysis? Exercise Cause-and-Effect...

TMS/T/N 1003 SYSTEMATIC INNOVATION AND INNOVATIVE PROBLEM SOLVING Semester 1 2022/2023 TRIZ Tool : Cause & Effect Analysis Content What is Cause-and-Effect Analysis? Types of Cause-and-Effect Analysis How to use Cause-and-Effect Analysis? Exercise Cause-and-Effect Analysis Case Study What is Cause & Effect Chain analysis? A cause-and-effect analysis generates hypotheses about possible causes(reasons) and effects(results) of problems A Cause & Effect Chain (CEC) analysis diagram is a structured way of expressing hypothesis about the causes of a problem or about why something is not happening as desired It helps to focus attention on the process where a problem is occurring and to allow for constructive use of facts to narrow down on the actual causes It cannot replace empirical testing of these hypotheses, it does not tell which is the root cause, but rather the possibilities How to use Cause & Effect Chain analysis? Step Process Step 1 Negate the goal of the problem and write it in the target problem Brainstorm about likely causes and then sort them into major categories Step 2 or branches depending on the method chosen Continue to brainstorm and generate a list of causes and fill them in Step 3 the appropriate categories or branches Keep asking "Why?" and "Why else?" for each cause until a potential Step 4 root cause has been identified Use team’s best collective judgment to choose several areas they feel are Step 5 most likely causes and eliminate the unlikely causes Use team’s best collective judgment to choose several areas they feel Step 6 are most likely causes and eliminate the unlikely causes Validate hypothesis to confirm the likely root cause which is the key Step 7 problem, and proceed to implement the solution Go back and choose other causes for testing if the initial selection is incorrect Source: Gen3, Partners, Sergei Ikovenko Example Source: Gen3, Partners, Sergei Ikovenko  Cause & Effect Chain Analysis Normal wear Filament wearout Why? Filament Manufacturing Power is Out Why? broken issue Mechanical Why? Why? Shock Light bulb no Poor current Socket cracked protection in longer works There is no light circuit Current Spike when switch is turned on Switch is Power spike Others? broken from grid Others? Others? = tested this possibility, not a cause Continue until the “why” cannot be answered. You will reach the cause that is a fundamental law of physics or chemistry, or technology limit The end of the chain is a potential actual root cause Example Case Study from Procter & Gamble Source: Gen3, Partners, Sergei Ikovenko Source: Gen3, Partners, Sergei Ikovenko Source: Gen3, Partners, Sergei Ikovenko Exercise School-children shoulder always painful Face-mask clouding spectacles EBB cannot switch on