An interim or test fix resolves a particular defect or series of defects in a particular component (for example, SQL Warehousing Tool). An interim fix is a certified fix that is generally available to all customers between regularly scheduled fix packs, refresh packs, or releases.
A test fix is a temporary fix that is supplied to specific customers for testing in response to a reported problem.
A fix pack is a cumulative collection of fixes that has been fully tested by IBM. In some cases, a fix pack may include new functionality. Depending on the product, a fix pack may require the existence of the base product before it can be applied. Fix packs increment the release fix, the 'F' in the V.R.M.F. sequence.
A refresh pack is a cumulative collection of fixes that also includes new functionality. A refresh pack has been fully tested by IBM. Depending on the product, a refresh pack may require the existence of the base product before it can be applied. Refresh packs increment the release modification, the 'M" in the V.R.M.F. sequence.