The emulsion formulator is generally concerned with understanding the effects of storage and shipping conditions on shelf-life which may include extremes of temperatures and exposure to sunlight, vibration and humidity. Hence, formulations are stored under standardized test conditions and carefully examined at periodic intervals. Table 1 lists general conditions commonly and historically used to evaluate emulsion stability, though regulated emulsion products must be tested in compliance with applicable ICH guidelines. Further, although freeze-thaw has been widely used as an accelerated path to judge emulsion stability, it is not truly appropriate to rely solely on it to make those judgements. The cycling of temperature in freeze-thaw experiments affects parameters other than those that