We are currently building a datawarehouse and will need to engage the customers in order to successfully specify the datamarts, a search functionality, etc. All of the technicalities are scoped and being put in place. The question hence directs itself to successfully engaging the customer base, without whose input this could never be successful. Some of the customers were easy to contact, but some 500 customers are scattered around the globe in different user pockets. We have been supplying data to these customers one way or the other in the past. How would you suggest we tackle engaging these customer pockets?