This book constitutes the refereed proceedings of the 18th EAI International Conference on Performance Evaluation Methodologies and Tools, Valuetools 2025, which took place in Glasgow, UK during December 11-12, 2025
The 18 full papers presented in this volume were carefully reviewed and selected from 46 submissions. They were organized into topical sections as follows: Queueing Models; Stochastic Models; Cyber Attacks; Tools; Networks and Routing.