Introduction to the special issue on timed and stochastic approaches to system evaluation

Abstract This special issue of the International Journal on Software Tools for Technology Transfer presents extended versions of four selected papers from QEST+FORMATS 2024, the first joint edition of the International Conference on Quantitative Evaluation of Systems (QEST) and the International Conference on Formal Modeling and Analysis of Timed Systems (FORMATS). The joint conference was held in Calgary, Canada, in September 2024. The papers provide a compact snapshot of current directions in quantitative evaluation and timed systems research.