An MRC Technical Report covering 26 key parameters in selecting suitable paper stock for printing 'scannable' sheets for high-speed scanning. There can be no success in achieving reliable, fast, and accurate electro-optical scanning of data-bearing documents, unless critical attention is given to the selection of paper stock used to print the documents. This report covers the many variables related to paper stock specifications: size, 'squareness', grain-direction, curl, tear/burst strength, caliper, fiber content, opacity, reflectivity, and others. Industry standards exist for the measurement of these parameters, and MRC honed these standards further to meet our own requirements