1. Symptoms
Purpose: To break the problem into specific, manageable symptoms.
What are the observable symptoms?
Specify the deviation, e.g. , your observation of how long the delay is, what is moving slowly, or what the wrong output consists of.
A signal (light, sound, error message) indicating that a threshold was exceeded.
A result produced by a function that is not normal.
A period where nothing happens, that is longer than normal.
A speed that is less or greater than normal.
Which symptom should we first?
Next step
If the cause or solution is already known, continue to
4. Actions.
Otherwise, continue to
2. Facts, because there is a need to find the unknown cause.
