"What do we mean when we say 'systems thinking?'. We can use the phrase to refer to a set of tools - such as causal loop diagrams, stock and flow diagrams and siulation models - that help us map and explore dynamic complexity.  We can also use it to mean a unique perspective on reality - a perspective that sharpens our awareness of whole and of how the arts within those wholes interrelate. Finally, systems thinking can refer to a special vocabulary with which we express our understanding of dynamic complexity. For example, systems thinkers often describe the world in terms of reinforcing and balancing processes, limits, delays, patters of behaviour over time, and so forth" - Barry Richmond