update: small introduction to literature review

chap2/literature_review.tex

@@ -2,9 +2,17 @@
 % WRUED: https://www.ccohs.ca/oshanswers/diseases/rmirsi.html
 
 \section{Literature Review}
-% To better understand which metrics and methods are meaningful in the domain of keyboards and especially when
+In this section, we gathered information about conventional methods, tools and
+metrics that are used in the domain of keyboard related research. We were
+particularly interested in how keyboard usage is related to health risks, the
+status quo of keyboard design, which metrics to use when conducting a typing
+related experiment and previous studies that evaluated the impact of key
+actuation force on those metrics. The information collected during the
+literature review ensured a profound understanding of those topics, which helped
+us during the design phase of our two preliminary studies and the main
+study. Additionally, we partially established our hypotheses based on the
+results of previous research.
 
-% To investigate whether or not solely the actuation force of individual keys can make a difference in terms of efficiency or satisfaction an ....
 \subsection{Work Related Upper Extremity Disorders}
 \label{sec:wrued}
 \Gls{WRUED} is a term to describe a group of medical conditions related to
@@ -401,7 +409,7 @@ questionnaires can help to gather subjective feedback about the keyboards and
 thereby reveal differences that cannot be easily acquired by a device or formula
 \cite{rowley_surveys}.
 \end{phga_sum*}
-
+\pagebreak
 \subsection{Observer Bias and a Possible Solution}
 \label{sec:bias}
 As already discussed in Section \ref{sec:metrics}, it is common practice in