COVID-19 and global equity for health: The good, the bad, and the wicked

[...]in wicked problems, the elusive problem formulation precludes a shared understanding of success, or even progress, by stakeholders. [...]in wicked problems, the absence of a shared agenda (and measures of progress) undermines aligned and effective action. [...]the HIV response has used the cascade framework to define clear targets and extract commitments from elected leaders to meet those targets, thereby enabling measurable progress. The initiative has enrolled over 350 cities around the world—with the mayors of London, Paris, and other cosmopolitan cities all vocal advocates of 90–90–90. Because the cascade is reported, progress toward 90–90–90 can be widely assessed, creating some basis for accountability.