Sophisticated logical analysis can then help us draw conclusions. Until recent decades many people considered logic an arid subject, useless for practical purposes. Then, as is so often the way with ideas, computers came along and made excellent use of the fundamental principles of logic. That is, for a field to possess theory it must have a body of theory which covers a substantial portion of the material and problems in the field, and which is systematically organized so that it all hangs together and the various parts are consistent with each other. A model is a mini-theory which, like, theory generally, focuses on a few elements abstracted from the totality of reality.
People differ in willingness to construct and believe long chains of reasoning.
Mathematical arguments are the most prominent example of such long chains. And some mathematicians pride themselves on their ability to hold long chains of logic in their minds, as if this is a sign of general intellectual power. I suggest that this is more like a talent for tightrope walking - spectacular but seldom practical, and extremely dangerous at all times. Especially with respect to the study of human behavior, long chains of reasoning seldom produce reliable knowledge. Every step in the reasoning depends upon empirical evidence.