  This white paper reports on the discussions of the 2018 Facility for Rare
Isotope Beams Theory Alliance (FRIB-TA) topical program "From bound states to
the continuum: Connecting bound state calculations with scattering and reaction
theory". One of the biggest and most important frontiers in nuclear theory
today is to construct better and stronger bridges between bound state
calculations and calculations in the continuum, especially scattering and
reaction theory, as well as teasing out the influence of the continuum on
states near threshold. This is particularly challenging as many-body structure
calculations typically use a bound state basis, while reaction calculations
more commonly utilize few-body continuum approaches. The many-body bound state
and few-body continuum methods use different language and emphasize different
properties. To build better foundations for these bridges, we present an
overview of several bound state and continuum methods and, where possible,
point to current and possible future connections.
