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+%\documentclass{article}
+\documentclass[a4paper,12pt]{article}
+\usepackage[english]{babel}
+%\usepackage[a4paper,top=20mm,bottom=20mm,left=20mm,right=20mm,marginparwidth=1.75cm]{geometry}
+\usepackage[a4paper,top=20mm,bottom=20mm,left=20mm,right=20mm]{geometry}
+\usepackage{array}
+\usepackage[framemethod=tikz]{mdframed}
+\usepackage{makecell}
+\usepackage{enumitem}
+\usepackage{xcolor}
+\usepackage{parskip}
+
+\newcolumntype{P}[1]{>{\centering\arraybackslash}p{#1}}
+\newcolumntype{M}[1]{>{\centering\arraybackslash}m{#1}}
+
+\newenvironment{changemargin}[2]{%
+\begin{list}{}{%
+\setlength{\topsep}{0pt}%
+\setlength{\leftmargin}{#1}%
+\setlength{\rightmargin}{#2}%
+\setlength{\listparindent}{\parindent}%
+\setlength{\itemindent}{\parindent}%
+\setlength{\parsep}{\parskip}%
+}%
+\item[]}{\end{list}}
+
+% Useful packages
+\usepackage{amsmath}
+\usepackage{graphicx}
+\usepackage[colorlinks=true, allcolors=blue]{hyperref}
+
+%\title{Your Paper}
+%\author{You}
+\begin{document}
+%\maketitle
+
+%\begin{abstract}
+%Your abstract.
+%\end{abstract}
+
+\begin{center}
+{\Huge \textsc{NGI POINTER: GNU Taler UX Study}}
+\end{center}
+
+\section{Context}
+
+For the NGI POINTER programme, the GNU Taler team developed
+age-restricted payments and P2P payments, which were supposed
+to be evaluated in a usability study to gather feedback and
+inform further development.
+
+The BFH ``Digitaltag'' is an annual day-long event where the
+university presents itself to the public. It is held right next to the
+central train station of Biel/Bienne, and is open to the general
+public.  It was attended by a mixture of prospective students, normal
+adults, Swiss executives and retirees.
+
+We used the opportunity to both present GNU Taler to the public, and
+to conduct usability studies with interested volunteers.
+
+\begin{figure}[h!]
+  \includegraphics[width=\textwidth]{digitaltag-ux-setup.jpg}
+  \caption{Our booth, with GNU Taler publications (including on
+    age-restrictions), NGI stickers, and a Taler-enabled coffee machine.}
+\end{figure}
+
+
+\section{Preparation}
+
+We prepared several notebooks with a browser running a Taler wallet as
+well as several Android phones with a the Taler Android wallet.  We
+setup the coffee machine and three Taler backends, one for CHF (used
+by the coffee machine), one for KUDOS (used with age-restrictions in
+the browser-based setup) and one for Bitcoin (used for P2P payments).
+We also prepared a rough write-up describing what we would like users
+to do.  These intended user stories are included in the appendix.  We
+note that during the day, we permitted participants to deviate from
+the script if they desired to do so, sometimes leading them to explore
+other GNU Taler features (and us learning interesting lessons about
+those).
+
+For the UX study, we prepared four tables: two tables with the coffee
+machine and information materials, and two tables with additional
+chairs for guests for the actual UX experiment.
+
+\begin{figure}[h!]
+  \includegraphics[width=\textwidth]{digitaltag-ux-chairs.jpg}
+  \caption{Tables for the UX study with Prof. Benoist.}
+\end{figure}
+
+\section{Data collection}
+
+We did not collect any PII on the participants.\footnote{Except for
+one executive who had come just for our booth from Zug and who gave us
+his business card as he hopes to collaborate with us in the future.}
+Instead, each team member wrote down their observations.  We
+afterwards deduplicated the observations and turned those that could
+lead to improvements into over 20 new issues on the GNU Taler
+bugtracker (\#7334--\#7354).
+
+\section{Key conclusions}
+
+The day revealed the existence of several previously unknown bugs
+(like refresh not working properly with the new features) as well
+as quite a few surprising difficulties of users (not finding the
+QR code button, not finding the account balance, not understanding
+that the ``shop.demo.taler.net'' page is the shop where they should
+buy things). We will try to rectify those as soon as possible.
+
+
+\end{document}