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Tableau is an eminently capable enterprise analytics tool. It's expensive to scale and expensive to implement, but it's eminently capable to get the best from the software. Tableau Prep is a product that you can use to clean and prepare your data before creating visualizations. Analysts may need some training and support into your Tableau deployment plans. Don't expect users to use Tableau as an Excel Successor to replicate Excel reports and charts already built with Excel or similar spreadsheet software.