Audit Pattern Optimization in Service Industry using Six Sigma Methodology. - Jonnel D. Alejandrino; Darlyn Jasmin A. Magno; Ronnie Concepcion II; Sandy Lauguico; Vincent Jan D. Almero; Rogelio Ruzcko Tobias; Elmer P. Dadios; Ramón Flores; Cheerobie Aranas (TENCON, 2020)