 Phase I has as its goal the first statistical detection of
the HI 21 cm signal from reionization.HERA II entails applying
lessons learned during Phase I to define and build a larger array
capable of detailed characterization of the statistical signal and
imaging the brightest reionization structures.The final stage
of HERA, Phase III, will address the challenges of full tomographic
imaging using an SKA-scale facility with capabilities informed by the
earlier work.