[who_would_fardels_bear]

To physicists the term 'measurement' is more often used than 'observation' to mean the same thing. Schroedinger's Cat points up what is often called the 'measurement problem'. Here is a long but interesting discussion of the four current main candidates for resolution of the measurement problem for all those interested:

The Measurement Problem

[Nifster]

As a metrologist ( no not weather). I appreciated this article very much

[Nifster]

Yeah I know it was a lecture. Still enjoyable

[SunkenCiv]

Thanks!