This primer is a concise introduction to Articles 3 and 4 of the Uniform Commercial Code - negotiable instruments, checks and more modern payment systems. It covers recent developments such as the mortgage crisis, the transition of check collections from paper to digital images, the growth in the use of debit cards and stored value cards as payment devices, payments made over the internet through non-bank intermediaries and mobile payments. The Third Edition covers all significant developments in the 21st century. A valuableresource thatwill benefit bothlawyers and law students."