This session covers all methods and scales used for registering, processing and understanding of magnetic anomalies and corresponding upper lithospheric sources: from satellite missions to oceanic profiles and detailed ground based arrays, and from mathematical processing to petrophysical and geological ground evidence. Presentations on compilation methods of heterogenous data sets, useful definitions of anomalies, and studies of eventual temporal anomaly change are also encouraged. Cases of geological interpretation of magnetic anomalies jointly with other geodata are warmly welcome.