What is the modern mainstream way to deal with the measurement problem? For this question, the measurement problem is the problem of formalizing wave function collapse when the observer is part of the model (say I want to simulate an observer+observee quantum system on a computer). I am aware of proposed solutions: Everett, Bohm, and decoherence (though decoherence apparently does not explain collapse). How does mainstream physics deal with this issue?

For example: Given two electrons initially isolated from each other and the universe which then interact , can each electron be considered an observer? With no-collapse theories each electron sees the other election's wave function collapse relatively. If the mainstream view holds that a single electron cannot be an observer what is the criterion for an observer?

What is the modern mainstream way to deal with the measurement problem? For this question, the measurement problem is the problem of formalizing wave function collapse when the observer is part of the model (say I want to simulate an observer+observee quantum system on a computer). I am aware of proposed solutions: Everett, Bohm, and decoherence (though decoherence apparently does not explain collapse). How does mainstream physics deal with this issue?

For example: Given two electrons initially isolated from each other and the universe which then interact , can each electron be considered an observer? With no-collapse theories each electron sees the other election's wave function collapse relatively. If the mainstream view holds that a single electron cannot be an observer what is the criterion for an observer?