Many moons ago I created a network troubleshooting checklist which you can download here. The purpose of the checklist is to provide a structured method to identify reasons for outages, errors and failures in a similar manner to those used by the aviation industry, namely checklists. However, one the most important steps predates any outage on a last mile link and that step needs to occur when it is provisioned. This is the commissioning test also known as the soak test. It is oft overlooked by fulfillment engineers in the hast to deliver the service to the client. However, the result is invariable a large amount of wasted time and effort during assurance.
Read the article over at LinkedIn here.