Synergy, also known as synergism, refers to the combined effects produced by two or more parts, elements, or individuals. Simply stated, synergy results when the whole is greater than the sum of the parts. For example, two people can move a heavy load more easily than the two working individually can each move their half of the load. Synergy can be a positive or negative outcome of combined efforts.

According to the American Heritage Dictionary, the term "synergy" is derived from the Greek word sunergos, meaning "working together." Positive synergy is sometimes called the 2 + 2 = 5 effect. Operating independently, each subsystem can produce two units of output. However, by combining their efforts and working together effectively, the two subsystems can produce five units of output.

Negative synergy can be called the 2 + 2 = 3 effect. Again, individuals operating alone can each produce two units of output. However, with negative synergy, the combination of...