to send and receive data it needs to be \emph{fault tolerant}. The SUT
needs to properly handle errors in received data or complete unavailability
of the underlying channel.
- \item \textbf{Security}\\
- \emph{Confidentiality} is an important aspect for the SUT. Received data
- should only be delivered to the program to which it is addressed.
\end{itemize}
-This leaves three categories which are not relevant the SUT. Below we will
+This leaves four categories which are not relevant the SUT. Below we will
shortly discuss per category why these are not relevant. \emph{Maintainability}
is an important aspect of any software system, however for the SUT it is not a
core aspect, as it is first and foremost of importance that the implementation
core aspect either, as the SUT is not used directly by humans, but is a service
which is addressed when another program needs it. \emph{Portability} isn't
either as the SUT is installed on a system once and intended to work on that
-system.
+system. \emph{Security} isn't a feauture of the SUT either, systems using the
+SUT can add their own security mechanisms on top of it.
+
\subsubsection{Quality in use}
Quality in use is dived into five subcategories. Below we will discuss the