A qualification system for determining the effects of one or more upgrades or modifications to a chilled water plant is disclosed herein. The qualification system my collect various data from operating logs of a chilled water plant. The data may be collected in stages, where at least one first stage may be used to collect data used to identify representative log data. The representative log data may then be used to perform an accurate analysis to determine the effects of one or more upgrades or modifications. In this manner, the qualification system provides accurate analysis while reducing data entry. In addition, the qualification system may accept varying amounts of data such as to reduce percentage error or the like in its analysis.