  In this work we explore first necessary steps to contruct a fully massive
version of a variable flavour number scheme. In particular we focus, as an
example, on an extension of the five-flavour scheme, where instead of
neglecting explicit initial state quark mass effects, we retain all massive
dependence, while keeping the resummation properties of the massless
five-flavour scheme. We name this scheme five-flavour-massive (5FMS) scheme.
Apart from consistently modified parton distribution functions, we provide all
the ingredients that are needed to implement this scheme at MC@NLO accuracy, in
a Monte Carlo event generator. As proof of concept we implement this scheme in
SHERPA, and perfom a comparison of the new scheme with traditional ones for the
simple process of scalar particle production in bottom quark fusion.
