2080-1335 Behaviourist approach as the need to use methods based on recognising customer behaviour in support of the AML/CFT system Kędzierski Maciej Aleksander author Correspondence to: Maciej Aleksander Kędzierski 21 11 2025 Numer 33 (17) 2025 347 390 Copyright © 2025 2025 Behavioural science, as a method based on the observation of behaviour, can be widely used to profile and identify clients of obligated institutions as potential perpetrators/suspects in money laundering or terrorist financing. This applies to both the assessment of the client’s physical behaviour in the relationship with the institution and their online behaviour, e.g. within the scope of the online banking offer. In the first area, an approach based on psychology, sociotechnics and rhetoric also becomes useful. In the second case, the latest technological solutions based on artificial intelligence and traces left on mobile devices are used. 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