TEMPEST - Synthesis Tool for Reactive Systems and Shields in Probabilistic Environments

Stefan Pranger*, Bettina Könighofer, Lukas Posch, Roderick Bloem

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


We present Tempest, a synthesis tool to automatically create correct-by-construction reactive systems and shields from qualitative or quantitative specifications in probabilistic environments. A shield is a special type of reactive system used for run-time enforcement; i.e., a shield enforces a given qualitative or quantitative specification of a running system while interfering with its operation as little as possible. Shields that enforce a qualitative or quantitative specification are called safety-shields or optimal-shields, respectively. Safety-shields can be implemented as pre-shields or as post-shields, optimal-shields are implemented as post-shields. Pre-shields are placed before the system and restrict the choices of the system. Post-shields are implemented after the system and are able to overwrite the system’s output. Tempest is based on the probabilistic model checker Storm, adding model checking algorithms for stochastic games with safety and mean-payoff objectives. To the best of our knowledge, Tempest is the only synthesis tool able to solve 2 -player games with mean-payoff objectives without restrictions on the state space. Furthermore, Tempest adds the functionality to synthesize safe and optimal strategies that implement reactive systems and shields.

Original languageEnglish
Title of host publicationAutomated Technology for Verification and Analysis - 19th International Symposium, ATVA 2021, Proceedings
EditorsZhe Hou, Vijay Ganesh
Place of PublicationCham
Number of pages7
ISBN (Electronic)978-3-030-88885-5
ISBN (Print)978-3-030-88884-8
Publication statusPublished - 2021
Event19th International Symposium on Automated Technology for Verification and Analysis : ATVA 2021 - Virtuell, Australia
Duration: 18 Oct 202122 Oct 2021

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume12971 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference19th International Symposium on Automated Technology for Verification and Analysis
Abbreviated titleATVA 2021

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

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