Linköping University | IDA Master thesis | Computer Science Autumn term 2016 | LITH-EX-A--16/006--SE Adapting infinite-scroll with the user experience in mind Jonas Karlsson Martin Larsson Supervisor, Rita Kovordanyi Examiner, Magnus Bång Upphovsrätt Detta dokument hålls tillgängligt på Internet – eller dess framtida ersättare – under 25 år från publiceringsdatum under förutsättning att inga extraordinära omständigheter uppstår. Tillgång till dokumentet innebär tillstånd för var och en att läsa, ladda ner, skriva ut enstaka kopior för enskilt bruk och att använda det oförändrat för ickekommersiell forskning och för undervisning. Överföring av upphovsrätten vid en senare tidpunkt kan inte upphäva detta tillstånd. All annan användning av dokumentet kräver upphovsmannens medgivande. För att garantera äktheten, säkerheten och tillgängligheten finns lösningar av teknisk och administrativ art. 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For additional information about the Linköping University Electronic Press and its procedures for publication and for assurance of document integrity, please refer to its www home page: http://www.ep.liu.se/. © Jonas Karlsson, Martin Larsson TABLE OF CONTENTS 1 Introduction .................................................................................................................................................... 1 1.1 Motivation ............................................................................................................................................. 1 1.2 Aim ....................................................................................................................................................... 1 1.3 Research questions ................................................................................................................................ 2 1.4 Limitations ............................................................................................................................................ 2 2 Theory ............................................................................................................................................................ 3 2.1 Background ........................................................................................................................................... 3 2.2 Proposed solutions from research ......................................................................................................... 3 2.2.1 Loading content ................................................................................................................................ 3 2.2.2 Unloading content ............................................................................................................................. 4 2.2.3 Bookmarking and making the back-button work as intended ........................................................... 4 2.2.4 Functionality to remember previously seen content that can be worth seeing again ........................ 5 2.3 Frameworks and plugins for infinite-scroll ........................................................................................... 5 2.4 Usability ................................................................................................................................................ 5 2.5 Evaluation ............................................................................................................................................. 5 2.5.1 Quantitative study ............................................................................................................................. 6 2.5.2 A/B testing ........................................................................................................................................ 6 2.5.3 Google analytics ............................................................................................................................... 6 2.5.4 Survey ............................................................................................................................................... 6 3 Method ........................................................................................................................................................... 7 3.1 Pre-study ............................................................................................................................................... 7 3.1.1 Google Analytics .............................................................................................................................. 7 3.2 Implementation ..................................................................................................................................... 7 3.2.1 System overview ............................................................................................................................... 7 3.2.2 Content loading ................................................................................................................................. 8 3.2.3 Bookmarking and making the back-button work .............................................................................. 8 3.2.4 Functionality to remember previously seen content that can be worth seeing again ........................ 9 3.2.5 An indicator of where the user is in the feed and where it ends........................................................ 9 3.2.6 Pagination ......................................................................................................................................... 9 3.2.7 A/B testing ...................................................................................................................................... 10 3.3 Evaluation ........................................................................................................................................... 10 3.3.1 Survey ............................................................................................................................................. 10 4 Results .......................................................................................................................................................... 12 4.1 Pre-study ............................................................................................................................................. 12 4.1.1 Goals with the site .......................................................................................................................... 12 4.1.2 Identified problems ......................................................................................................................... 12 4.1.3 Measurement plan ........................................................................................................................... 13 4.1.4 Areas of improvement .................................................................................................................... 14 4.2 Implementation ................................................................................................................................... 14 4.2.1 Overview of the implementation .................................................................................................... 14 4.3 Evaluation ........................................................................................................................................... 15 4.3.1 Statistics .......................................................................................................................................... 15 4.3.2 Survey ............................................................................................................................................. 17 5 Discussion .................................................................................................................................................... 18 5.1 Pre-study ............................................................................................................................................. 18 5.1.1 Google Analytics ............................................................................................................................ 18 5.1.2 Measurement Plan .........................................................................................................................