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Recent extended formulations of the Wigner's friend thought experiment throwthe measurement problem of quantum mechanics into sharper relief. Here Irespond to an invitation by Renner to provide a consistent and concrete set ofrules for quantum mechanics which can avoid the apparent paradox formulated byFrauchiger and Renner [Nat. Comm. 9, 3711 (2018)]. I propose a slight additionto standard textbook quantum mechanics, in the form of two rules, which avoidsthe paradox. The first specifies when a given quantum dynamics can beinterpreted as a measurement. Potentially any dynamics can, but doing sodepends on the context of other performed operations. The second requires thata joint context be used to determine whether several different dynamicalevolutions can all be interpreted as measurement. The paradox is then avoidedbecause not every participant in the Frauchiger-Renner thought experimentregards the stated dynamical descriptions of the experiment as measurements.

Consistency in the description of quantum measurement: Quantum theory can consistently describe the use of itself