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In General, When Something is mentioned as Best of the Best means “that it is of the Highest Quality, excellent or Highly desirable type.” In Process excellence the BOB can be explained in such a way that, In a Controlled Process, if the value of specific dimension plotted continuously in a control chart the plotted distribution goes up and down from the nominal. While this degree of variation will naturally occur in a process which is called common-cause or Natural variation. But still Process owners can make use of this opportunity to study why the reading is not very near to Nominal always. From this we can understood that the Values which is very near to the Nominal are BOB (Best of the Best) and values which are extreme from the Nominal are WOW (Worst of the Worst) Example: In Bi-lateral tolerance, if we take a nominal value this is called Best of the Best value (BOB). Consider the specified value 85.50+/-0.3 Here the USL (Upper Specification Limit) is 85.80 And LSL (Lower Specification Limit) is 85.20 And the Nominal value is 85.50. Hence BoB (Best of the Best) value is 85.50 In Unilateral tolerance, Consider the Value 20.00+0.000/-0.004 Here the USL (Upper Specification Limit) is 20.000 Here the Nominal value is the Highest limit of the dimension i.e., 20.000 Hence the BoB value is 20,000 All the Process owners desire to achieve BOB in their process and WOW (worst of the Worst) being the opportunity to evaluate the process. The process must be studied thoroughly why the BOB and WOW occurs. In Continuous Improvement, if we capture these values in exact process conditions it gives us thorough understanding of the process. also, it provides insights on variable and constant parameters to be maintained, in order to achieve the best BOB value in the process. Based on this data, we can understand which parameters can be tuned to achieve the BOB value. Tools like DOE can be used to screen and optimize these variable parameters. Note: Other factors like Process cost, Pricing and End user product criticality, etc., also needs to be considered while optimizing the BOB value.