A detailed article and download by Jack Zigon, President, Zigon Performance Group on the subject.
Overview:
Twenty years experience measuring the "hard stuff" have yielded best practices which can save time and improve the quality of performance measures for teams and other hard-to-measure work. This article describes a process for creating performance measures for any kind of work and the learning resulting from implementing these systems. It concludes with a case study illustration of the how-to steps and their products.