  The ratio of the vacuum expectation value of the two Higgs doublets,
tan(beta), is an important parameter of the general 2-Higgs-Doublet Model
(2HDM) and the Minimal Supersymmetric extension of the Standard Model (MSSM).
The expected uncertainty on the determination of tan(beta) at a Linear Collider
(LC) of at least 500 GeV center-of-mass energy and high luminosity is reviewed
based on studies of neutral and charged Higgs boson production.
