Sales and Secured Transactions Teaching Materials - American Casebook Series Author:Richard E. Speidel, Robert S. Summers, James J. White The fifth edition includes problems and notes on some of the proposed revisions of Article 2 now under study. This edition also takes account of developments under Article 9, including recent cases and the new definition of security interest in section 1-201(37). There are also entirely new materials on Article 2A on leases of goods.