3PLs need to verify data and, where possible, visit the customer's premises to see at first hand the operation and understand what the processes are. They need to clarify the terminology used and ensure they are happy with the data. It is always difficult to make assumptions if the operation is different to previous contracts. This may not always be possible if the warehouse is being operated by an existing 3PL. However, if operated by the company outsourcing the work, there is no excuse.