Summarize Porter's view on how IS might lead to a competitive advantage. What are his key thoughts and how and why do you believe his prescriptions are$/$are not relevant today?

How does Carr's view on the role of IS in strategy differ from the ones suggested from $1)$ the other value disciplines and $2)$ Porter $($cost leadership, differentiation, focus, RGT$,$ and Five Forces model, operational effectiveness, strategic positioning$)$