e-HealthExpert.org - Primum non nocere

System: a definition

A system is an entity which maintains its existence through the mutual interaction of its parts.

A system exists and operates in time and space.

The concept of Emergence: a definition

From the mutual interaction of the parts of a system there arises characteristics which can not be found as characteristic of any of the individual parts.

(Source: Gene Bellinger, in Mental Model Musings)