what is the Bracketing & Matrixing.

Answer Posted / sirisha

Bracketing: is the design of a stability
schedule such that only samples on the extremes of certain design factors (e.g., strength,
container size and/or fill) are tested at all time points as in a full design. The design assumes
that the stability of any intermediate levels is represented by the stability of the extremes
tested.
Matrixing: is the design of a stability
schedule such that a selected subset of the total number of possible samples for all factor
combinations would be tested at a specified time point. At a subsequent time point, another
subset of samples for all factor combinations would be tested. The design assumes that the
stability of each subset of samples tested represents the stability of all samples at a given time
point.

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