Defining and validating high level design metrics
At the operational level, for each goal question(s) are established which when answered will indicate if the goal has been achieved.
It approaches software measurement using a three level model; conceptual, operational, and quantitative.The first three steps are crucial and correspond to the main activities at each level in the model as described above.Develop goals on corporate, division, or project level.Sigma is a letter in the Greek alphabet which becomes the statistical symbol and metric of process variation.
It scales the characteristics of defects per unit, part per million defective and the probability of a failure.
At the conceptual level, goals are set prior to metrics collection.