P and R measures are the statistics

Statistics

Statistics is the study of the collection, organization, analysis, and interpretation of data. It deals with all aspects of this, including the planning of data collection in terms of the design of surveys and experiments....

 used to evaluate the efficiency

Efficiency

Efficiency in general describes the extent to which time or effort is well used for the intended task or purpose. It is often used with the specific purpose of relaying the capability of a specific application of effort to produce a specific outcome effectively with a minimum amount or quantity of...

 and effectiveness

Effectiveness

Effectiveness is the capability of producing a desired result. When something is deemed effective, it means it has an intended or expected outcome, or produces a deep, vivid impression.-Etymology:...

 of business process

Business process

A business process or business method is a collection of related, structured activities or tasks that produce a specific service or product for a particular customer or customers...

es, particularly automated business process

Automated business process

Many computer systems are available in the commercial marketplace that address the various aspects of Business Process Management. Most address one specific set of functionality; for instance, some allow the processes to be mapped and documented ; others allow for simulations to take place...

es.

The P measures are the process measures – these statistics that record the number of times things occur. Examples would include:

• the number
  Counting
  Counting is the action of finding the number of elements of a finite set of objects. The traditional way of counting consists of continually increasing a counter by a unit for every element of the set, in some order, while marking those elements to avoid visiting the same element more than once,...
  
   of times an error loop is used
• the number of times an approval loop is used
• the average
  Average
  In mathematics, an average, or central tendency of a data set is a measure of the "middle" value of the data set. Average is one form of central tendency. Not all central tendencies should be considered definitions of average....
  
  time to complete a particular task in the process

and show how efficient the process is.

The R measures are the results measures – these statistics record the 'outcomes' of the process. Examples would include:

• the number of occasions when the process completed correctly
• the number of times rejections occurred
• the number of times approval was not given

and show how effective the process is.