Human resource development (HRD) professionals have an obligation to provide programs/products with the highest probability of success. The exclusion of workers' perspectives, from "their" standpoint, would seem to produce suboptimal results. Therefore, consulting workers' literature, labor and working class histories, management histories, and other sources that represent the workers' lived experiences would, on the face of it, provide additional data that would help gain insights into the root cause failure of past programs and increase the probability of success. These data sources also raise awareness of topics not typically found in a managerial discourse. Suggested sources are included. (Contains 16 notes.)