Typical threats connected with the implementation of Business Intelligence systems are: - badly estimated costs and time of realization - badly estimated implementation aims - lack of client commitment - lack of employees responsible for implementation - lack of support for project and low awareness of changes - communication problems - employees non approval of software Main problems, with the biggest impact on project, usually appear in the beginning of realization. Their consequences lengthen the time of achieving aims and they have negative impact on the involvement and the realization of the project.