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A supply chain usually does not stand alone. Frequently a supply chain is defined by the need of the end customer which has to be satisfied. Since one company commonly deliver several products, within a single company there can be multiple different supply chains aggregated under one organization. This task of managing multiple supply chains is most often referred to as Supply Chain Portfolio Management. It is still in a very early stage of research, so there are only few researchers focusing on this part.

Today there is only one simple question: Single or dual sourcing, what strategy should be used when faced with disruption risks.

A typical supply chain risk management process consists of four steps: risk identification, assessment, management and monitoring. From those steps, one of the most neglected step is the risk monitoring.
Risk monitoring implies two different actions: Continuous risk assessment and actions, as soon as pre-defined limits are reached.

So this article sheds light on the risk monitoring, from an article by Blackhurst, Scheibe and Johnson (“Supplier risk assessment and monitoring for the automotive industry”).

I often recommend Supply Chain Risk: A Handbook of Assessment, Management, and Performance as a good overview of supply chain risk management literature.