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How to evaluate Public Displays
Florian Alt1 , Stefan Schneegaß1 , Albrecht Schmidt1 ,
Jörg Müller2 , Nemanja Memarovic3
1

VIS, University of Stuttgart

{firstname.lastname}@vis.uni-stuttgart.de
2

Telekom Innovation Laboratories, TU Berlin

[email protected]
3

University of Lugano

[email protected]
ABSTRACT
After years in the lab, interactive public displays are finding their way into public spaces, shop windows, and public institutions. They are equipped with a multitude of sensors as well as (multi-) touch surfaces allowing not only the audience to be sensed, but also their effectiveness to be measured. The lack of generally accepted design guidelines for public displays and the fact that there are many different objectives (e.g., increasing attention, optimizing interaction times, finding the best interaction technique) make it a challenging task to pick the most suitable evaluation method. Based on a literature survey and our own experiences, this paper provides an overview of study types, paradigms, and methods for evaluation both in the lab and in the real world. Following a discussion of design challenges, we provide a set of guidelines for researchers and practitioners alike to be applied when evaluating public displays.

Figure 1: Studying public displays in the lab (left) / field (right) hence providing opportunities for researchers to create novel interaction techniques. Hence, there is an emerging need for both practitioners and researchers, to understand how to best evaluate public displays with regard to effectiveness, audience behavior, user experience and acceptance, and social as well as privacy impacts. Since today no commonly accepted guidelines exists as to how (applications for) public displays should be designed, the evaluation of these is both crucial and challenging for several reasons. First, display deployments are often opportunistic. As new infrastructure or real estate is being created, the premises are often augmented with public displays, having only little knowledge of the audience. Second, simulations of the environment a display is deployed in are difficult, as there are no (dynamic) models yet (e.g., of the stream of visitors passing through a pedestrian area). As a result, evaluation has to be conducted in context (both in the real world and in the lab). Third, there is not one single goal that public displays (or their content) try to achieve. Ads most likely strive for maximizing attention, interactive games may want to create an engaging experience, informative applications (e.g., a public transport schedule) may aim at maximizing usability, and some displays may be deployed to show warnings to passers-by or support the fast evacuation of a building. Fourth, measuring the effectiveness of a display is difficult. Compared to the internet, it is often not possible to monitor user interaction, but sensors might in the future allow to extract richer information based on the interaction. This, however, might raise privacy concerns (e.g., when using a camera in public space), hence determining and restricting the means for evaluation. In order to tackle these challenges, we set out to provide guidelines for evaluating public displays. Our work is grounded in a comprehensive literature survey, based on which we identified common study types, paradigms, and methods including their respective advantages and disadvantages. We discuss and validate them, ultimately deriving guidelines that can help researchers and practitioners to choose an evaluation method for their public display.

Keywords
Public Displays, Evaluation, Digital Signage, Methods

Categories and Subject Descriptors
H.5.2 [Information Interfaces and Presentation]: User Interfaces—Evaluation/methodology

General Terms
Experimentation, Human Factors

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INTRODUCTION

Interactive public displays are leaving the labs and are being deployed in many places. Nowadays, they permeate public spaces, shop windows as well as malls, workspaces, and public institutions and are equipped with sensors, such as cameras, that enable presence and motion sensing. At the same time, new (consumer) devices and software enter the market (e.g., the Microsoft Kinect), Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. PerDis 2012, June 04 - 05 2012, Porto, Portugal.

Copyright 2012 ACM 978-1-4503-1414-5/12/06 ...$10.00.

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RELATED WORK

esed qualitatively based on subjective feedback, e.g., in focus groups to collect the target group’s view and concerns [11] or quantitatively based on questionnaires [23].

Our research is based on an extensive literature review with the goal to identify methods and tools that are used to evaluate public display. As of January 2012, 522 papers can be found in the ACM Digital Library that are concerned with public displays or digital signage. Most of these papers evaluate their concepts and deployments. Even nowadays, more than 30 years after Hole-in-Space1 , one of the first public display installation, neither design guidelines for public displays exists, that cover a broad spectrum of systems and applications, nor do generally accepted evaluation guidelines. However, several ideas have been around in recent years.

Cheverst et al. [11] reported on challenges of evaluating situated displays deployed in a community setting. Storz et al. published lessons learned from the deployment of the eCampus public display network [36] that provides useful information for informing the design of public display (networks) but only little information with regard to evaluation. Mankoff et al. [20] looked at the evaluation of ambient displays, focusing mainly on effectiveness and usability. Starting from Nielsen’s usability heuristics, they created a modified set to be used for the evaluation. Finally, Matthews et al. [21] used activity theory to evaluate peripheral displays. They identified an initial set of evaluation metrics (appeal, learnability, awareness, effects of breakdowns, and distraction), that vary depending on the importance of the display, but do not focus on evaluation methods. Though many research papers provide useful lessons learned or recommendations based on their findings (e.g., [15, 36]), most previous work either focusses on a rather specific application domain (community/situated displays, ambient displays), draws from findings of their deployment(s) only, or treats evaluation only on the side / on a high level. To overcome these limitations, we base our findings on a comprehensive literature review, identifying research questions, research types, and approaches to research and methods used in public display research.

Table 1 provides a summary of research projects classified by the tackled research questions. Furthermore, we distinguished whether the evaluation was conducted prior to creating a prototype by asking users or running an ethnographic study, or whether a prototype was evaluated in a lab study, field study, or in the context of a deployment (see section 4.3 Paradigms).

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• User Performance: Measuring effectiveness from a user’s perspective is often done when evaluating novel interaction
techniques, e.g., based ...

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Keywords

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