1986) mandates that express findings of fact must be made in (1) all child support cases not involving public assistance and (2) public assistance cases in which the trial court departs from the child support guidelines. Id. at 863; see also State ex rel. Meneley v. Meneley, 398 N.W.2d 28, 31 (Minn.Ct.App. 1986); Carver County Community Social Services v. Fritzke, 392 N.W.2d 290, 293 (Minn.Ct.App. 1986). Without such findings, a trial court's decision is without foundation and cannot be understood on appeal.