This publication is a reference document meant to accompany other National Skill Standards Board (NSSB) publications that describe the development of skill standards, including Built to Work: A Common Framework for Skill Standards. This companion guide provides the NSSB Complexity Rating Skill Scales. Chapter 1 explains briefly how this tool fits into the NSSB's larger efforts to develop national skill standards. Chapter 2 contains the academic skill scales. These academic knowledge and skills categories are included: mathematics, science, reading, and writing. Chapter 3 contains the employability skill scales. These employability knowledge and skills categories are included: listening; speaking; using information and communications technology; gathering and analyzing information; analyzing and solving problems; making decisions and judgments; organizing and planning; using social skills; adaptability; working in teams; leading others; building consensus; and self-development and career development. In both chapters, knowledge and skills are further divided into complexity dimensions and complexity subdimensions. For each (sub)dimension, the level of complexity (low, moderate, or high) required for performing the critical work function is identified. (YLB)