Here are two possible, rather different, answers:

- Use the theory of everything (when a candidate appears) to calculate and then to measure deviations either form the standard model or from general relativity. Compare the results.

- Use the theory of everything (when a candidate appears) to calculate the constants of the standard model (the mass of the electron, 137.03, muon mass, quark masses), and compare the calculation results with measurements.

Which answer is more correct?

Which answer is more realistic?

Are there other answers?