It’s the question on everyone’s minds: What will it take for us to come out of this period of extreme social distancing and return to some semblance of normal life?

It turns out that the Centers for Disease Control and Prevention has been working on a plan to allow the U.S. to safely begin to scale back those policies. CDC Director Robert Redfield spoke with NPR on Thursday, saying that the plan relies on not only ramped-up testing but “very aggressive” contact tracing of those who do test positive for the coronavirus, and a major scale-up of personnel to do the necessary work.

Contact tracing is the process of finding and reaching out to the contacts of someone who tests positive for an infectious pathogen. Those contacts are then quarantined or monitored, and if any of them are also positive, the process is repeated with their contacts, and on and on, until the chain of transmission is halted. It’s a labor-intensive, time-consuming practice that for decades has been a fundamental public health tool for containing infectious diseases.

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