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Ultra-cool dwarf stars are abundant, long-lived, and uniquely suited toenable the atmospheric study of transiting terrestrial companions with JWST.Amongst them, the most prominent is the M8.5V star TRAPPIST-1 and its sevenplanets, which have been the favored targets of eight JWST Cycle 1 programs.While Cycle 1 observations have started to yield preliminary insights into theplanets, they have also revealed that their atmospheric exploration requires abetter understanding of their host star. Here, we propose a roadmap tocharacterize the TRAPPIST-1 system -- and others like it -- in an efficient androbust manner. We notably recommend that -- although more challenging toschedule -- multi-transit windows be prioritized to constrain stellarheterogeneities and gather up to 2$\times$ more transits per JWST hour spent.We conclude that in such systems planets cannot be studied in isolation bysmall programs, thus large-scale community-supported programs should besupported to enable the efficient and robust exploration of terrestrialexoplanets in the JWST era.

A roadmap to the efficient and robust characterization of temperate terrestrial planet atmospheres with JWST