The ideal gas law, "PV = nRT," is one of the simplest physical laws in nature that is introduced to students as early as in high school and first year in college. In this equation, "P" stands for pressure, "V" is the volume, "n" is the amount expressed in mole, "T" is the temperature in Kelvin scale, and "R" is the ideal gas constant. The traditional approach of introducing the ideal gas law involves three historical experiments by Robert Boyle, Jacque Charles, and Amedeo Avogadro. They each observed that "V [direct proportionality] 1/P," "V [direct proportionality] T," and "V [direct proportionality] n," respectively. Mathematically, we can put them together to yield "V [direct proportionality] nT/P." Designating the proportionality constant as "R," we have "V = R . nT/P" or "PV = nRT" as is mostly written. I call this the "bottom-up" approach in which we make individual measurements first and then consolidate them into one unified equation. In this paper, the author presents a logical way to unite the three gas laws together, a "top-down" approach where a systematic logical investigation is performed first, and then proposes a series of experiments that are both minimal and optimal. It provides a new theoretical perspective to the experimental facts and a new way of presenting the ideal gas law at the college intro level through a heuristic approach.