Skeptics of negotiating with North Korea, including on some days the Trump administration, often point to the breakdown of the Agreed Framework as proof that diplomacy doesn’t work. In doing so, they overlook several key facts, including that the agreement succeeded for eight years and that the United States was partially responsible for its collapse. There are lessons to be learned from the Agreed Framework, especially now that the Trump administration has indicated that diplomacy is back on the table. The main takeaway should not be that diplomacy doesn’t work, but that diplomacy can and does work when pursued tactfully, seriously and patiently.