TopRank has an automated "what if" analysis that works with Microsoft Excel to allow users to define output cells; TopRank can then automatically find and vary all the input cells that could affect your entered output, said the vendor. TopRank improves the accuracy of @RISK analysis software by narrowing down the focus of large models before running @RISK. When run with PrecisionTree, meanwhile, TopRank can identify the most critical factors in large and complex tree models, the vendor said.