Managerial accounting is quite different from financial accounting. External reporting rules are replaced by internal specifications as to how data are to be accumulated and presented. Hopefully, these internal specifications are sufficiently logical that they enable good economic decision making. For example, specific reporting periods may be replaced with access to real-time data that enable quick responses to changing conditions. And, forecasted outcomes become more critical for planning purposes. Likewise, cost information should be disseminated in a way that managers can focus on (and be held accountable for!) those business components (“segments”) under their locus of control.