Adelphi Consulting Group is a marketing research firm specializing in consumer and retail research and has been in operation for more than 25 years. The firm offers various services including market analysis, studies for market-entry, post-opening of stores, troubled-store, frequent-shopper program, specific departments of the stores, business-to-business, strength and weakness, employee opinion and image tracking. The firm has an in-house telephone facility and is based in Beaverton. Ore.