  The internal variable methodology of nonequilibrium thermodynamics, with a
symmetric tensorial internal variable, provides an important rheological model
family for solids, the so-called Kluitenberg-Verh\'as model family [1]. This
model family is distinguished not only from theoretical aspects but also on
experimental grounds (see [2] for plastics and [3, 4, 5] for rocks). In this
article, we present and discuss how the internal variable formulation of the
Kluitenberg-Verh\'as model family can be presented in the nonequilibrium
thermodynamical framework GENERIC (General Equation for the Non-Equilibrium
Reversible-Irreversible Coupling) [6, 7, 8, 9], for the benefit of both
thermodynamical methodologies as well as for promising practical applications.
