Glossary O

Operational schemes refer to Piaget"s term for schemes that utilize cognitive operations, or mental "actions of the head,” that enable one to transform objects of Thought and to reaso

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Operationalization refers to the process by which concepts are made measurable.

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Operationism refers to the position that concepts are defined by the operations used to measure and produce them, but ignores the fact that at least two (2) sets of observations are n

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Operations is defined as flexible, reversible mental manipulations of objects, in which objects can be mentally transformed and then returned to their original states. In Piaget's theory, particular types of cognitive schemes that are mental (that is, require symbols), derive from action, exist in organized systems (structures of the whole), and follow a set of logical rules, most importantly that of reversibility.

opiate refers to addictive psychoactive substance such as heroin, opium, or morphine that causes temporary euphoria and analgesia that reduces pain

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Opiate drugs is a class of drugs derived from, or similar to those derived from, opium poppies. Please see also Opiate

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Opiates refer to narcotic drugs derived from the opium poppy.

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Opinion Evidence refers to evidence which generally is inadmissible in court, opinions can be provided by lay and expert witnesses