Dell Computer Corporation The marketing concept that has proven to be the most successful for the Dell Computer Corporation also happens to be their business. The differentiated marketing: different buyers, different strategies. The bold-concept – direct customer contact – has made Dell one of the most successful companies of the 1990s. Through its pioneering direct business model, Dell Computer Corporation offers in-person relationships with corporate and institutional customers; telephone and Internet purchasing (the latter now averaging $14 million per day); customized computer systems; phone and on-line technical support; and next-day, on-site product service. Dell arranges