\section{Motivation}
\label{sec:label}


% In recent years, computers are used to some extend in almost every industry in
% Europe \cite{eurostat_ent_w_comp} and China \cite{iresearch_ent_w_comp}. This
% leads to the conclusion, that also other countries must have a high usage of
% computers in corporations. Furthermore, according to a statistic published by
% \citeauthor{itu_hh_w_comp} in 2019, nearly half of the worldwide households have
% access to at least one computer \cite{itu_hh_w_comp}. One of the most used
% devices for data input while operating a computer is the keyboard
% \parencite[22]{handbook_chi}. Therefore, people who use a computer, either at
% home or to fulfill certain tasks at work, are also likely to use a keyboard. An
% important part of a keyboard is the keyswitch also called keyboard key or
% key. Those keyswitches use, depending on the manufacturer or keyboard type,
% different mechanisms to actuate a keypress. More commonly used mechanism to date
% are scissor switches, mostly used in laptop keyboards, rubber dome and membrane switches,
% often used in low- to mid-priced keyboards, and mechanical switches which are
% the main switch type for high-end and gaming keyboards
% \cite{ergopedia_keyswitch}. Depending on the mechanism and type of key used, it
% is possible that different force has to be applied to the key to activate
% it. Normally, the force required to activate a key is identical for each key
% across the keyboard. However, previous research has shown, that there is a
% disparity in force generated by different fingers
% \cite{bretz_finger_force}. This raises the question, why there are no keyboards
% for personal or work related use cases with adjusted actuation forces per finger
% or even customizable keyboards, where an individual can select the actuation
% force for each keyswitch individually.

% In recent decades, computers and other electronic devices have become an
% indispensable part of everyday life. Computers are used in almost every industry
% \cite{iresearch_ent_w_comp, eurostat_ent_w_comp} and almost half of the
% worldwide households have access to at least one computer \cite{itu_hh_w_comp}.
% Even 153 years after the first typewriter was patented \cite{noyes_qwerty, }
% people still use keyboards as their main way to input data into a computer
% \parencite[22]{handbook_chi}, \cite{broel_dektop_or_smartphone}. A potential
% problem while interacting with a computer through the usage of a keyboard are
% rapid movements of the fingers over a prolonged time.

% Input tasks are not only restricted to pure data entry but also include complex
% inputs required by games.


% Prolonged usage of computers can lead to serious diseases



% With the rising popularity of smartphones and other touchscreen devices
% \cite{gs_statcounter_dmt_2020} which utilize virtual keyboards to fulfill a
% variety of tasks that also include data entry, e.g., writing text messages,
% short emails, communicating on social media or web browsing