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We present a discussion of the extended Wigner's friend thought experimentproposed by Frauchiger and Renner in [1]. We show by using various arguments,including textbook quantum mechanics and the ontological approach of Contexts,Systems, Modalities (CSM), that no contradiction arises if one admits thatagents must agree on what is considered as a system and what is not. In such acontextually objective approach of quantum mechanics, the apparentcontradiction is automatically removed. We also discuss why this mutualagreement between agents is already implicit in the standard formulations ofquantum mechanics, and why removing it leads to inconsistencies.

A contextually objective approach to the extended Wigner's friend thought experiment