Validation of cycle parameters involves using multiple biological (spore) tests. For long thin pouches, it is necessary
to use three biological indicators in each test pack, one placed at each end and one in the middle of the pouch. With
larger packs, one indicator should be placed in each corner and one in the centre of the pack. The test pack with multiple
indicators must be prepared in triplicate such that one can be processed on each of three consecutive cycles. A 10th
indicator is not sterilised, but rather is used as a positive control. After the three cycles have been completed, the 10
biological indicators comprising the nine which have been processed, and the 10th (as a control) are then developed and
the results recorded