
64 • Root Cause Analysis
Step 4: Act: Perform conrmation testing if the hypothesis was sup-
ported or move to the next cycle of PDCA and use induction to form
a new hypothesis if the tested hypothesis was not supported.
Step 5: Plan: Use the knowledge gained from the previous PDCA cycle to
form a new hypothesis using induction.
Step 6: Do: Assume the new hypothesis is true for the sake of testing and
evaluate it empirically, through either experimentation or observation.
Step 7: Check: Compare the actual results against predicted results.
Step 8: Act: Perform conrmation testing if the new hypothesis was sup-
ported or move to the next cycle of PDCA ...