The document presents the classification of the 285 activities present in the MEMORIA information system in May 2022. Activities are the 'atomic' elements of this system. They identify the different actions carried out during a research process. Within the MEMORIA IS activities are used in to build/elaborate graphs representing workflows mobilised to produce research outputs. In the structuring stage of a process, activities are organised in sequences reflecting their relative order (e.g., chain sequences, parallel sequences, iterative sequences ...). Then, at the specification stage, they are detailed and annotated – picking up the relevant descriptors, singling out people involved in the activity, mentioning sources and inputs upon which the activity is based, instruments, temporal clues (e.g. dates or duration of activities), and so on. To enable this use, activities were first identified through an elicitation campaign. Each activity was defined, exemplified and documented, and in most cases characterised by a set of specific descriptors. Activities are divided into five groups corresponding to different phases of work (data acquisition, data filtering and treatment, data analysis, exploitation protocols, finalisation). Within each group, activities are organised hierarchically from the most general to the most specific ones and represented in what we call "wheels of activities". This hierarchy is intended to provide flexibility: it allows the user to select a relatively generic activity where information is unclear or incomplete. It should be noted that the list of activities present in the MEMORIA IS at this stage is not universal: it only corresponds to the needs of those who created and then extended it. Consequently, the definitions and their descriptors correspond to a specific context - this of the research and development activities of the laboratory of origin of the system (UMR 3495 CNRS/MC MAP) - the proposed definitions are therefore to be understood as aligned with the practices, knowledge or know-how of this laboratory. The initial set of activities was extended so as to include a group of activities related to building archaeology as a result of collaboration between UMR MAP-Gamsau and the LAT team (UMR 7324 CITERES). It should be mentioned that the list of activities presented in this document represents a milestone in the development of the system, which we expect to be enriched as future collaborations are initiated. It therefore does not claim to be exhaustive, and the reader will note that while certain branches of the wheels of activities are quite developed, while others remain very general. Each extension will require the identification and organisation of discipline- or user- specific activities, and therefore will require further knowledge elicitation campaigns.