¶7. … The three standards of appellate review of circuit court decisions have been stated numerous times, although case law has articulated sub-principles and different ways of stating the standards of review: (1) A reviewing court will not overturn findings of fact unless clearly erroneous. (2) A reviewing court will sustain a discretionary decision that is the product of a rational mental process by which the facts of record and law relied upon are stated and are considered together for the purpose of achieving a reasoned and reasonable determination. (3) A reviewing court will decide questions of law independently of the circuit court but benefiting from its analysis.
Cases discussing basic review-principles are legion, of course. E.g., State v. Iran D. Evans, 2004 WI 84, ¶¶19-20.