According to the theory of Memes coined by Richard Dawkins, evolution depends not on the particular chemical basis of genetics, but only on the existence of a self-replicating unit of transmission—in the case of biological evolution, the gene. For Dawkins, the meme exemplified another self-replicating unit with potential significance in explaining human behavior and cultural evolution: the effect a meme has on society is based on the application of the meme after understanding the qualities essential to the meme. According to the theory, memetic engineering is, simply put, the analysis of an individual or individuals' behavior, the selection of specific memes and the distribution or propagation of those memes with the intent of altering the behavior of others. A memetic engineer doesn't particularly have to consciously make the decision to alter another individuals behavior. It can happen unconsciously when specific behavior is observed, transmitted and then replicated within the observer. Memes themselves are neither good nor bad. For example, "racism" is an ideology that is made up of several memes. When a meme is introduced, those concepts begin to take on their own process of evolution based on the person who adopts the ideology, internalizes it, and reintroduces it into society causing it to spread like a virus.