We manufacture reinforced concrete floors. We have a prototype Excel app for customers to use in estimating what size of slab they need. The app needs redevelopment to streamline it, improve error handling, validate data, and simplify the interface. Teh app comprises several worksheets and code with modules and class modules containing many custom functions. It only runs successfully on PC and we want it to run on Macs as well. Contact Andy Beeton for copy of project.