Top single-family executives at Fannie Mae and Freddie Mac described new technology upgrades and the success of their credit-risk transfer programs during remarks at last week’s secondary market conference sponsored by the Mortgage Bankers Association. Andrew Bon Salle, executive vice-president for single-family business at Fannie, said the GSE is working to enhance the customer experience and make doing business with the company simpler and more certain. He said customers are reporting sharp gains in efficiency from Fannie’s collateral underwriting tool, and a new version of Desktop Underwriter will be rolled out next month. A key feature in version 10.0 of DU is the inclusion of trended credit data.