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Defining the boundaries of EROI analysis is difficult: how far back do you go when adding up the energy required to produce a form of energy? You can easily end up with a deep regression, making analysis impossible. Likewise the time of use issue. Dave raises some important points here, although staffing a planning office, for example, falls outside the typical boundaries. The authors of EROI research papers are usually careful to identify their boundaries of analysis, and readers should note those parameters carefully.