*4.2.2 Overview tab*

The overview tab covers the requirement "Visualize data to get an overview". This tab comprises three high-level charts of the uploaded data, as shown in **Figure 6**. The main objective of the Overview tab is to find trends and patterns in the data using a single interactive view.

The design of the Overview tab is divided into two sections. The left **side bar** consists of a drop-down for the high-level charts (Parallel-coordinates, Sankey

**Figure 6.** *ViDAS overview tab.*

diagram, and PCA (Principal Component Analysis)), whereas the main canvas in the middle of the tab shows the selected type option from the drop-down. When the Overview tab is clicked, Parallel-coordinates is shown by default. Optionally, the user can switch to another chart option from the drop-down list. Here, Parallelcoordinates allows comparison of the individual observations (series) on a set of numeric variables. While Sankey diagram is a visualization technique that allows displaying data flow and PCA indicates variation and brings out strong patterns in a data set. It is often used to make the data easy to explore and visualize.
