Safety, security, and dependability assessment of digital systems

We specialise in high-assurance industries, in particular, nuclear energy. We provide expert consulting, policy development, and cutting-edge research to ensure the reliability and trustworthiness of critical digital infrastructure.

Our expertise spans assurance of AI, risk assessment, assessment of digital systems and safety justification, helping organisations navigate complex regulatory and technical challenges.

With internationally recognised leadership in AI governance, I&C architectures, and digital system trustworthiness, we support industry and regulatory bodies—including contributions to IAEA initiatives —in driving innovation, compliance, and good practices in system dependability and assurance.

Dr Sofia Guerra FREng has played pivotal roles in safety and assurance of digital systems and is internationally recognised as an expert in dependability assessment and justification of digital systems in the nuclear industry. As a leader and entrepreneur, she led Adelard’s growth until acquisition in 2022 and set up Themistoclea in 2025.  She has pioneered the UK approach to justifying digital devices for nuclear facilities, impacting major projects, including UK nuclear build projects. She has shaped international approaches to safety assurance, authored IAEA reports, and is a key contributor to innovation on AI in nuclear applications.