The increasing complexity of global supply chains has made third-party logistics (3PL) service providers essential for companies seeking operational flexibility and cost efficiency. On-time delivery, a critical performance metric, directly impacts customer satisfaction, long-term business partnerships, and corporate reputation. However, challenges such as subcontractor management, subjective performance evaluation, and uncertainty in data significantly affect the reliability of performance assessments. This study proposes a novel decision support system utilizing Interval-Valued Spherical Fuzzy Analytic Hierarchy Process (IVSF-AHP) and Interval-Valued Spherical Fuzzy Technique for Order of P... More >