A data processing system and method are disclosed which finds particular application to equity finance mortgages. An Overall System (600) is formed from a Target Investment System (100), an Asset Origination System (200), an Asset Securitization System (400), an Asset Servicing System (300) and an Asset Management System (500). Financial feedback is applied to ensure targets are achieved. Mortgages are pooled and on-sold to investors and selected for acceptance on the basis of preferences expressed by the investors.