It sounds like a textbook title. It doesn't really have a clear meaning. It also sounds vaguely as if the idea of the title is to "translate" some kind of technical term into simpler English, instead of saying "Textbook of Behavioral Psycholinguistics" or some such jargon.
Without trying to define the words "function," "process," or "structure" precisely, perhaps an example of use might help.
The function of a car engine is to provide power to move the car.
The processes inside a car engine include compression, combustion, and exhaust.
The structure of a car engine includes pistons, cylinders, a connecting rod, and a flywheel.