Legal drinking age. The legal drinking age is the age at which a person can legally consume or purchase alcoholic beverages. These laws cover a wide range of issues and behaviors, addressing when and where alcohol can be consumed.
An open system is a system that has external interactions. Such interactions can take the form of information, energy, or material transfers into or out of the system boundary, depending on the discipline which defines the concept.
Open Systems Theory Michael N. Bastedo, University of Michigan Entry, The SAGE Encyclopedia of Educational Leadership and Administration Draft: April 28, 2004 Open systems theory refers simply to the concept that organizations are strongly influenced by their environment. The environment consists of other