List of Articles improve Open Access Article Abstract Page Full-Text 1 - Developing an economical model for reliability allocation of an electro-optical system by considering reliability improvement difficulty, criticality, and subsystems dependency Maryam Mohamadi Mahdi Karbasian Open Access Article Abstract Page Full-Text 2 - Product quality improvement model considering quality investment in rework policies and supply chain profit sharing Amanda Sofiana Cucuk Nur Rosyidi Eko Pujiyanto Open Access Article Abstract Page Full-Text 3 - Operator agency in process intervention: tampering versus application of tacit knowledge P. Van Gestel D. J . Pons V. Pulakanam Open Access Article Abstract Page Full-Text 4 - Process capability improvement through DMAIC for aluminum alloy wheel machining G. V. S . S. Sharma P. Srinivasa Rao B. Surendra Babu Open Access Article Abstract Page Full-Text 5 - Curbing variations in packaging process through Six Sigma way in a large-scale food-processing industry Darshak A. Desai Parth Kotadiya Nikheel Makwana Sonalinkumar Patel