Hello everyone, as we discussed this Tuesday, we will slow down the pace a little bit so that we can reduce the number of assignments from 4 to 3. Accordingly, the deadline for assignment 1 will be extended to Oct 27.

Yesterday, we did a quick look at Tableau. Next Tuesday, we will do some exploratory visualization with Tableau. But we still have many functions in Tableau that we cannot cover. You can refer to some resources online: 

• Learning Tableau Desktop by Tableau
• Tableau Tutorial by GeeksforGeeks
• Tableau: An Introduction. Princeton University
• Tableau Viz Gallery
• Tableau Dashboard Showcase

Also, Mik mentioned the new rule on accessibility of web content and mobile apps, which could impact how we do visualization, and Digital Accessibility Resource from WA Office of Equity. A few rules related to data visualization summarized by Google:

• No color-only data: You cannot use color as the single way to distinguish lines, bars, or slices.
• Add textures and markers: You must use symbols, distinct line styles, or high-contrast patterns alongside colors.
• Enforce strict text contrast: Text on charts must hit a minimum 4.5:1 contrast ratio against its background.
• Enforce strict graphical contrast: Visual elements like bars, lines, and borders must hit a minimum 3:1 contrast ratio against neighboring colors.
• Provide alt-text descriptions: Every chart must include text summaries that explain the main data trends and conclusions.
• Include raw data tables: Complex graphs must be paired with accessible data tables that screen readers can easily scan.
• Enable 100% keyboard control: Users must be able to navigate filters, tooltips, and interactive fields using only a keyboard.
• Design for 400% zoom: Layouts must dynamically scale up to 400% without overlapping text or requiring horizontal scrolling.

At thing, because of a medical appointment, Haoyu’s office hours on Oct 19 (next Monday) will be changed to 12:30 - 1:30 PM on the same day.