The three-year (2017-2020) Pre-ACT project was established as one of the three large projects in the first round of the Accelerating CCS Technologies (ACT) program (https://act-ccs. eu). Pre-ACT was a collaborative effort between partners from six research institutes and four companies with an active role in CCS. The project ambition was to deliver cutting-edge research into the safe storage and monitoring of CO2, particularly to improve strategies for monitoring and management of the pore pressure distribution within the storage reservoir. Pre-ACT has established methodologies for assessing the conformance of a storage site, relative to its expected performance. The primary outputs are quantitative conformance systems (protocols), which rely on cost-effective monitoring, and guidelines on how to act in case of non-conformance. The protocols are applicable to industrial operators and focus on the main storage-related challenges for accelerated deployment of CCS: capacity, confidence and cost.