Coming from data warehousing. Rewrites are normally instigated to get rid of data silos. Put everything in one place and model it the say way. Very few of these

Coming from data warehousing. Rewrites are normally instigated to get rid of data silos. Put everything in one place and model it the say way. Very few of these projects are ever finished and the irony is that each project ends up being a data silo. It is not unusual to have three so data warehouses within an organisation. Each just slightly different from the next but with 80% the same information. Turns out that last 20% in the 80/20 principle is very hard.