Definition:Mathematical Model/Parameter

Let $P$ be a stochastic process which is being modelled by means of a model $M$.
A parameter of $M$ is a number which implements some aspect of $P$ which is designed so as to be able to be modified during the evolution of $P$ as a result of analysis of the behaviour of $P$ over time.
$1$: Introduction:
$1.3$ Basic Ideas in Model Building:
$1.3.1$ Parsimony