EXECUTIVE SUMMARYThrough a better understanding of how businesses make use of knowledge, professionals can more fully leverage the intellectual capital available in their firms. To further this understanding, the authors conducted a study examining the impact, either directly or indirectly, of environmental and relational factors on CI usage. Specifically, the study focused on the influence of six environmental factors (centralization, formalization, market turbulence, speed culture, innovative culture, and openness culture) and five relational factors (involvement, communication, credibility, trust, and usefulness) on CI usage. In addition, it explores two consequences of using CI instrumentally and/or conceptually (decision-making ability and attitude toward CI). Among the study findings: Relational factors affect the usage of CI, which, in turn, affects the CI users' decision-making ability and their attitude toward CI. Environmental factors affect both the level of involvement of the CI user and the intensity of communication among the key players involved in the CI project, which, in turn, indirectly affect CI usage, the user's decisionmaking ability, and attitude toward CI.