A method for deciding the relationship between a physical property and a threshold, comprising measuring a physical property to obtain a measured value, calculating the distribution of actual values for the physical property, calculating the error distribution of the obtained measured value, calculating the penalty associated with an erroneous decision, and calculating a margin based on the expected loss from selecting at least one possible actual value as a function of the calculated distribution of actual values, the calculated error distribution of the measured value, and the calculated penalty associated with an erroneous decision. Embodiments including a system and apparatus are also disclosed.