  The use of conformal expansions for predictions in quantum chromodynamics is
discussed as a way to avoid renormalization scheme and scale ambiguities, as
well as factorial growth of perturbative coefficients due to renormalons.
Special emphasis is given to the properties of an assumed skeleton expansion
and its relation to the Banks-Zaks expansion. The relation of BLM scale-setting
to the skeleton expansion is also discussed and new criteria for the
applicability of BLM scale-setting are presented.
