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