For complete performance assessment, earned value techniques must be augmented with practices that
identify opportunities and risks, not just variances. For materials, resource tracking based on material
management system data and expediting and inspection observations provides a wealth of information for
assessing performance that may be affected by materials issues. Likewise for labor, work sampling
measures, work inspection observations, and other surveillance inputs provide information for assessing
labor productivity issues (and to some extent material issues as well).