Ruchikachorn, PuripantRattanawicha, PimmaneeAnna Puig and Renata Raidou2018-06-022018-06-022018978-3-03868-065-9http://dx.doi.org/10.2312/eurp.20181119https://diglib.eg.org:443/handle/10.2312/eurp20181119Sparklines are placed in documents but their usability is rarely evaluated in their immediate context of paragraphs of text. We conducted an eye-tracking study to measure readability and understandability of four different conditions: two different sparkline chart types (bar and line charts) and two text languages (native and non-native languages). We found out that most participants out of 296 in total were not distracted by sparklines. Only 3.19% of the average reading time was spent looking at sparklines. There was no correlation between dwell time and data understanding, measured in a post-experiment quiz. The chart types did not have a significant effect on sparkline attention. However, compared with native textual context, sparklines in non-native text were more noticeable. The results of this study can be useful for future sparkline usage consideration.Humancentered computingEmpirical studies in visualizationVisualization design and evaluation methods10.2312/eurp.2018111917-19