The course of the solubility curve of a surface active agent (SAA) close to the Kraft point was analyzed on the basis of the Van der Waals differential equation. The difference between the Kraft point and the triple point and melting point of the SAA, the application of the phase rule to the Kraft point, and the interpretation of the Kraft point as the freezing point of the micelles and premicellar aggregation of the SAA are discussed. It is shown that the different steps of the multistep process of molecular aggregation are not equivalent and that their paths are not uniform.