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\section{Overview}\label{sec:intro}  This document presents a parametric model to help design an Interferometric Array. An aspect of this problem is optimizing the value the array will have for a given scientific case subject to funding.   distance, energy, a  It describes the design parameters in \S~\ref{sec:var} and the system performance objectives in \S~\ref{sec:obj}, and the relationship between them. A python code used for visual analysis of array design options performance is introduced in \S~\ref{sec:python}. The python code is consistent with parameters and objectives selection in \S~\ref{sec:var} and \S~\ref{sec:obj}, and the mathematical relationships between them.  \section{Variables}\label{sec:var}  This section aims to include all relevant design parameters that might influence the selected performance objectives in \S~\ref{sec:obj}. 
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\subsection{Engineering cost vs. Calibration cost}  Tricky because you can compensate antenna quality with software. So the equations must capture this trade off.