Ameritech Corp has formed an alliance with Consumer Direct Access to produce print and electronic media that make it easier for consumers to shop at home, and is buying a significant stake in Consumer Direct Access on undisclosed terms; Consumer Direct Access publishes Catalyst-National Consumer Guide, a semiannual directory that serves as an information source for shoppers and a marketing tool for advertisers, and may offer the guide as part of its planned interactive television network in a few years; customers could access the information via television or phone.