    \begin{description}
	\item[Dependency]
	    A relationship between two or more parameters in which the state
		or value of one set of parameters depends on the state or value of
		another.
	\item[Dependee]
		The parameter upon which another parameter's state or value depends.
	\item[Dependent]
		A parameter whose state or value is determined by another
		parameter.
	\item[Parameter]
	    An input needed for a program.
	\item[ParameterList]
	    A class containing a list of parameters and other parameter lists.
	\item[ParameterEntry]
		A class containing a parameter located in a ParameterList
	\item[RCP]
	    Refernce Counted Pointer~\cite{RCP}. RCPs refered to in this document reference the
		RCP class located in the Teuchos package of Trilinos.
	\item[Sublist]
	    A parameter list contained within another parameter list.
	\item[Widget]
		A GUI element, usually used to obtain user input.
	\item[Validator]
		An object used to ensure a particular parameter's value is valid.
    \end{description}


