Abstract: A computer-implemented method to assist in managing supplier capacity to supply a supplied unit to at least a first user of the supplied unit by at least one supplier, for a series of periods, based on data as of a reference date, the series of periods being in the future relative to the reference date, comprising calculating a supplier capacity contingency ratio for each period, the supplier capacity contingency ratio for each period being a ratio between, a difference between the supplier future load for that period and the supplier reference-date available capacity for that period, and the supplier available capacity for that period. A computer-readable information storage device containing computer-executable instructions to carry out this method.