Six sigma yolu: GE, Motorola ve zirvedeki digÌŒer firmalarÄ±n performanslarÄ±nÄ± yuÌˆkseltme yoÌˆntemleri = The Six Sigma way: how GE, Motorola, and ... honing their performance (IÌ‡sÌ§ DuÌˆnyasÄ±)