The 4th meeting of the TG comprised a sub-group of the TG which met to discuss the draft report on list-mode data acquisition. The primary purpose of the 5th meeting was to finalise the State of the Art report on list-mode data acquisition for radiological detectors. The draft report prepared by the thematic group was discussed in detail, and modifications were agreed. The progress of other tasks being undertaken by this group of experts was reviewed, and the date of the next meeting was deferred to June to ensure that the meeting will be able to validate the proposals for data ‘reach back’ currently being prepared. Holding this TG meeting at CERN provided the participants the opportunity to visit some of the relevant CERN facilities, including a visit to the Isotope Separator On Line DEvice (ISOLDE), which produces a large variety of radioactive ion beams for many different experiments in nuclear and atomic physics.