what is bracketing stability
â¢ Bracketing is the design of a stability schedule such that only the extremes of certain. design factors are tested al all time points. - different strengths. - different container size and/or fill. â¢ Stability of intermediate levels represented by stability or tested extremes. â¢ Bracketing design not appropriate, if tested samples are not the extremes. â¢ Rationale for bracketing. - Interpolation between extremes is logical. - Useful where lage number of presentations.