Mobile Evaluation Log ===================== Evaluator: Peter Age Range : 40-49 Gender: male Profession: Professor Research Fields: Visualization Years of Experience: 25 Device: HP Elitebook 840 G10 OS and Version: Debian 13 Screen Size: 27" Screen Resolution: 3840 x 2160 Web Browser: Chromium 141.0.7390.107 Ad Blocker: none Internet Connection: none Screen Recording Software: OBS Studio 32.0.1 Recording Resolution: 1920 x 1080 Date of Evaluation: 2025-10-04 Negative Findings (Problems) ----------------- o PT-Neg01 Title: Input Characters into Table Description: The input of Characters into the table is not possible. If the user wants to input something other than a number, it does not work. No feedback is given. Video Clip: pt-neg01-characters.mp4 Heuristic: A01 Feedback How Reproducible?: Scroll down to the table on the right → try to change a number to a character o PT-Neg02 Title: Set range of a Dimension Description: Setting the range for a Dimension is not intuitive. It is hard to distinguish between setting the range and filtering on the icon only. Video Clip: pt-neg02-range.mp4 Heuristic: A02 Speak the Users' Language o PT-Neg03 Title: Remove Records Description: It is not possible to easily remove records from a chart. It only works in the first chart. Video Clip: pt-neg03-removing.mp4 Heuristic: A07 Flexibility and Efficiency of User o PT-Neg04 Title: Problems with Dimensions Description: This visualization technique gets worse as the number of Dimensions increases. This behavior is not shown in the application. Video Clip: pt-neg04-problems.mp4 o PT-Neg05 Title: Quick range change Description: There is no way to quickly change the range of a single Dimension. It can take a long time to get into the settings if it needs to be done a lot of times. Video Clip: pt-neg05-quick-setting.mp4 Heuristic: A07 Flexibility and Efficiency of User How Reproducible?: Scroll down to the second chart → Right-click on the name of a Dimension → click "Set Range" o PT-Neg06 Title: Select a Polyline by value Description: It is not possible to select one or multiple Polylines by clicking on a specific value on a Dimension. Video Clip: pt-neg06-selection.mp4 Heuristic: A07 Flexibility and Efficiency of User o PT-Neg07 Title: Indicate Actions Description: Action Indications on the chart are not possible. When hovering over a draggable object, for example, the user does not get this information. Video Clip: pt-neg07-indication.mp4 Heuristic: A01 Feedback o PT-Neg08 Title: Chart Intuitiveness Description: Once the user has read the description of a functionality, it needs to be remembered. The chart does not have the information on where to find specific functionality. Video Clip: pt-neg08-intuitiveness.mp4 Heuristic: A02 Speak the Users' Language o PT-Neg09 Title: Range on first chart Description: The range setting on the first chart does not work as the user intended. The maximum has to be bigger than the actual maximum, which is not clearly explained to the user. Video Clip: pt-neg09-range.mp4 Heuristic: A10 Help and Documentation How Reproducible?: Scroll down to first graph → Right-click on "Leftover" → click on "Set Range" → enter 2900 as Minimum → click "Save" o PT-Neg10 Title: Filter not set back correctly Description: The filter seems to be off, but it is still filtering. There is no distinction in the filtering icon if the filter is on or off. This behavior can cause confusion. Video Clip: pt-neg10-filter.mp4 Heuristic: A05 Error Prevention How Reproducible?: Scroll down to the first graph → Move a filtering slider down → move it back up while dragging the mouse horizontally Positive Findings ----------------- o PT-Pos01 Title: Moving dimensions Description: Moving dimensions is a key feature for the visualization of Parallel Coordinates. It is a necessary tool to find correlations and compare the different dimensions of the data. Moving dimensions in any Chart works without a problem. The Dimensions can be moved in any order. Video Clip: pt-pos01-moving.mp4 How Reproducible?: Scroll down to any Chart → Click and Hold the name of Dimension → Drag it to the left or right o PT-Pos02 Title: Useful for Education Description: In education, this application can be used as an additional resource. The interactivity helps the learning process. Video Clip: pt-pos02-education.mp4 o PT-Pos03 Title: Graph reset Description: Any Chart can be easily reset. This allows the user to always return to the initial state. Video Clip: pt-pos03-reset.mp4 How Reproducible?: Scroll down to any Chart → Click the Double-Arrow Menu → Click the most right icon from this list Bug Findings ----------------- o PT-Bug01 Title: Overlapping icons Description: Sometimes the range slider in a Chart overlaps with the Invert Arrow beneath the label. Video Clip: pt-bug01-overlap.mp4 How Reproducible?: No clear indication o PT-Bug02 Title: Breaking Case Study Description: When highlighting the first option in the Case Study, afterwards, going forward, multiple steps in the chart are taken at once. Stepping back does not work anymore. Stepping forward to Step seven and then reversing works. Video Clip: pt-bug02-case-study-breaks.mp4 How Reproducible?: Scroll down to "Case Study" → Highlight "Student Marks Dataset" with the mouse → click on the Forward button → click on the Backwards button