GGB Yes — that is the point of setting them out. Any operator with costed recipes, an honest P&L and a weekly count can track all four. The free Profit Leak Audit does a first pass in two minutes. Where GGB adds value is depth and execution: installing the recipes, controls and routines that keep the numbers in range, and rebuilding the structure when one of them is broken beyond an operating fix.
From How We Measure a Restaurant: The Four Numbers That Decide Profit — the full reading, with the method behind this answer.