  We present a formally deterministic representation for quantum history
theories where we obtain the probabilistic structure via a discrete contextual
variable: no continuous probabilities are as such involved at the primal level
-- we conceive as a history theory any theory that deals with sequential
quantum measurements but remains essentially a dichotomic propositional theory.
A major part of the paper consists of a concise survey of arXiv:
quant-ph/0008061 and quant-ph/0008062.
