4. Select a simple problem that you may have encountered in the past day or two, for example, your PC did not start, your electric razor did not work, your curling iron did not heat, or so on. Set up a fault tree for the problem.

Techniques for Root Cause Analysis

example like this

Car does not start Battery failure OR Starter problem OR OR) Terminals corroded Cables broken, loose. corroded Defective solenoid Starter motor failure No fuel AND Battery is old Weather too cold Fuel tank empty Fuel filter clogged Fuel pump defective