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\section{Discussion}
\label{sec:disc}
A major driver for the development of the \pwsp is the TEVA-SPOT
Toolkit~\cite{SPOT}, which supports research on sensor placement
optimization for water security applications. TEVA-SPOT uses the
\pwsp task driver to define the \code{sptk} script, which can execute
a variety of different workflows that represent different strategies
for sensor placement optimization.
The fact that \pwsp provides a self-contain facility for defining
and executing workflows is particularly important for TEVA-SPOT.
This code is targeted for distribution on desktop computers, and
\pwsp provides a convenient mechanism for flexibly developing new
sensor placement strategies that can be executed without a cumbersome
workflow management system. Parallel execution of \pwsp workflows
is a natural extension of the current capability, which would not
require a signficant extension of the current class definitions and
workflow syntax.
Finally, here are some notes concerning the current status of development in \pw:
\begin{itemize}
\item \pwsp includes a variety of methods managing parsers used to
initialize tasks. These methods were intended to simplify the setup
of commands using workflows. However, these methods have not proven
terribly useful in practice. Consequently, we could imagine
deprecating this feature of \pwsp unless clear use cases arise.
\item The \pwsp execution logic is simply a method of the \code{Workflow}
class. It would be worth exploring how this could be generalized
to (a) support threaded parallelism and (b) interface with third-party
grid- or cloud- computing workflow engines. This would provide a
nice extensibility of this capability while preserving the simple
Pythonic interface that \pwsp provides.
\item A preliminary resource class for files has been developed,
but simple use-cases for this class have not been flushed out.
\item Control flow tasks for looping and other more advanced
capabilities are not currently provided, but these will probably
be developed as the need arises.
\end{itemize}
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