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See also knowledge based system
Knowledge acquisition is a method of learning, first proposed by Aristotle in his seminal work "Organon". Aristotle proposed that the mind at birth is a blank slate, or tabula rasa. As a blank slate it contains no knowledge of the objective, empirical universe, nor of itself.
("Knowing subject" is often the description of a mind with acquired knowledge; but while no such page exits per se on Wikipedia, the use of the phrase is found throughout Wikipedia, and in the writings of David Hume, Karl Popper, and many others. [See also subject-object problem]. Therefore, a human mind cannot be a "knowing subject" until it has "acquired knowledge". "Acquired" in this sense can be either an adjective, as in "that which has been acquired"; or a verb, as in the act of acquisition.)
The acquisition of empirical knowledge, which begins the process of filling the tabula rasa, is thus by means of the experience of sensation and perception. Though sensation and perception are described elsewhere in Wikipedia as parts of "psychology, and not [of] anatomy or physiology," they belong to cognitive science. [See also cognitive revolution and philosophy of perception.]
The "five senses" referred to by the word sensation [see sense] are metaphorically the interface between empirical (sensate) reality and the consciousness of the knowing subject. A knowing subject for the purpose of this discussion of knowledge acquisition may be defined as any conscious creature capable of deriving direct and immediate sensate data from its environment.
Sensate data, or sensation, are distinct from perception. Perception is the recognition within the knowing subject of the event of having had a sensation. The tabula rasa and must learn the nature of sensation as the awareness of something which is outside itself. Commonly recognized sensory systems are those for vision, hearing, somatic sensation (touch), taste and olfaction (smell). [See sensory system]
Perception is the retention of a group of sensations transmitted through the sensory system(s), which gives the knowing subject the ability to be aware, not only of the singularity of stimuli presented by sensation itself, but of an entity, a thing, an existent. 
Retention of percepts allows the human mind to abstract information from the percepts. The abstraction is considered the extensional definition of the percept. An extension is "every object that falls under the definition of the concept or term in question."  This is the same as a universal (metaphysics) or genus or denotation, or class (philosophy).
Once a universal (class) has been identified, then the next step in the acquisition of knowledge is the abstraction of the intension, which is the particular, the species, or the connotation. Connotation as its meaning as particular is "the assertion that at least one member of one class of things is either included or excluded as a member of some other class."  This means, for example, that a poodle is the particular in a class or universal concept called "dog" or "canine".
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