| Course | BU 454 Data Visualization |
|---|---|
| Unit | Unit 6 |
| Paper type | Accessibility and color |
| Length | About 1,030 words, 6 pages |
| Format | APA 7 student paper |
| School | Herzing University |
| Program | BS in Business Analytics |
| Updated | September 2026 |
Free sample paper for BU 454 Unit 6
Nothing Carried by Color Alone: An Accessibility and Color Rebuild of Four Charts for a Composite Montana Ski Area, Checked Against WCAG 2.1
Student Name
Business, Herzing University
BU 454: Data Visualization
Instructor Name
March 25, 2026
Nothing Carried by Color Alone: An Accessibility and Color Rebuild of Four Charts for a Composite Montana Ski Area, Checked Against WCAG 2.1
Why the Charts Needed Rebuilding
Four charts made earlier in this course for Bearpaw Ridge, the invented Montana ski area, rely on color to carry meaning. The weekday and weekend dot plot used pale orange and pale blue dots; the ticket revenue chart highlighted season passes in green; the daily visits panel shaded holidays in pale red; and the ski area's own draft dashboard used a red-to-green scale for lift wait times. About one in twelve men and a smaller share of women have some form of color vision deficiency, most often difficulty telling red from green, and anyone reading a printed copy in grayscale or on a phone in bright sun loses color too. Each chart was rebuilt so that anything color carried is also carried by position, shape or a direct label, and each was checked against a published standard.
The standard is the Web Content Accessibility Guidelines, version 2.1 (W3C, 2018), which the ski area's website already follows. Three of its success criteria apply to charts: color must not be the only visual means of conveying information; graphical objects needed to understand content must have a contrast ratio of at least 3 to 1 against their background; and text must have a contrast ratio of at least 4.5 to 1.
Measuring the Original Colors
Contrast ratios were calculated for each original color against the white chart background using the formula defined in the guidelines.
| Color in original charts | Used for | Contrast with white | Meets 3 to 1 for graphics? |
|---|---|---|---|
| Pale orange #F4B183 | Weekday dots | 1.83 | No |
| Pale blue #9DC3E6 | Weekend dots | 1.84 | No |
| Pale green #A9D18E | Season pass highlight | 1.72 | No |
| Light gray #BFBFBF | Other bars | 1.84 | No |
Every original color failed the graphics threshold, which means some readers with typical vision in poor viewing conditions could barely see the marks, before color deficiency is even considered. Pale pastel palettes are a common default in presentation software, and they look soft on a bright monitor while vanishing on a projector or a printed page.
The Rebuilt Charts
The weekday and weekend dot plot now uses shape as well as color: weekdays are open circles and weekends filled triangles, and each series is labeled directly beside the first lift's dots, so no legend is needed. The colors come from a palette designed to remain distinguishable for the common forms of color vision deficiency (Okabe & Ito, 2008): blue #0072B2, with a contrast ratio of 5.19, and vermilion #D55E00, at 3.87. Both pass the graphics threshold, and a reader who sees neither color can still tell the series apart by shape.
The ticket revenue chart no longer uses green to single out season passes. All bars are dark gray #595959, with a contrast ratio of 7.0, and the season pass bar is distinguished by its bold label and an annotation beside it. Emphasis now comes from words and position, which survive any printing.
The holiday shading in the daily visits panel was pale red. It is now a light gray band, which is fine as background because it carries no information on its own: every shaded period is also labeled with its name and dates directly on the chart. The rule is that a background tint may help the eye, but the label carries the meaning.
The draft lift wait dashboard used a red-to-green scale, the pairing most readers with color vision deficiency cannot separate. It was replaced by a single-hue scale from light to dark blue, where darker means longer waits, with the number of minutes printed in each cell. Order is carried by lightness, which remains readable in grayscale, and exact values by the printed numbers.
Rules Adopted for Future Charts
The rebuild produced five rules that the ski area's marketing coordinator will apply to every chart from now on, written on a one-page checklist kept with the slide templates. First, any difference shown by color must also be shown by shape, position or a direct label. Second, data marks use only colors from the approved palette, each already measured at 3 to 1 or better against white. Third, all text, including axis labels and notes, uses colors measured at 4.5 to 1 or better. Fourth, red and green are never paired to mean opposite things, since that pairing is the one most readers with color vision deficiency cannot separate. And fifth, every chart is printed once in grayscale before it goes into a report. The checklist takes a minute to apply and prevents the problem from returning each time a new chart is made from a default template.
Beyond the Four Charts
The same review was run briefly on the ski area's public trail map and its snow report page, which are outside this unit's scope but share the problem. The trail map uses the industry's standard green, blue and black symbols for difficulty, and those already pair color with shape, a circle, square and diamond, so they pass. The snow report page, however, shows open and closed lifts only by green and red dots. It was flagged to the web contractor with a recommendation to add the words open and closed beside each dot, a small change that would make the page usable for every visitor checking conditions before driving up the mountain.
How the Rebuild Was Tested
Each rebuilt chart passed three checks. Every color used for data marks was measured and met the 3 to 1 graphics ratio, and every text label met 4.5 to 1; the medium gray #767676 used for axis labels measures 4.54. Each chart was printed in grayscale and read by a staff member who had not seen it, who answered its question correctly. And each was viewed through a color vision deficiency simulator for the red-green types; in all four, the series remained distinguishable because shape, position or labels carried them.
The rebuild did not remove color. Color still makes the charts quicker to read for most people, and the vermilion and blue pair is attractive in the owners' slide deck. What changed is that color now repeats information carried elsewhere rather than being its only carrier. Few (2012) recommends using color sparingly and for a purpose, and the rebuild uses fewer colors than the originals while communicating more. Bearpaw Ridge and all of its charts are invented for the course.
References
Few, S. (2012). Show me the numbers: Designing tables and graphs to enlighten (2nd ed.). Analytics Press.
Okabe, M., & Ito, K. (2008). Color universal design (CUD): How to make figures and presentations that are friendly to colorblind people. Jfly. https://jfly.uni-koeln.de/color/
W3C. (2018). Web content accessibility guidelines (WCAG) 2.1. https://www.w3.org/TR/WCAG21/
What the BU 454 Unit 6 instructions ask for
The sixth unit of BU 454 asks students to make charts accessible to readers with color vision deficiency and other viewing limits. Common requirements include identifying where color carries information, adding redundant encoding through shape, position or labels, meeting a named accessibility standard, and documenting how charts were tested. Many instructors ask which standard to reference and whether to stop using color; the Web Content Accessibility Guidelines are the usual reference, and color may stay as long as it is not the only carrier of meaning. Auditing an employer's dashboards is discouraged. The submission usually includes before and after descriptions, contrast measurements and an APA 7 explanation of tests.
How the BU 454 Unit 6 example is put together
The paper begins by listing four charts that relied on color and explaining who loses that information. It names three WCAG criteria that apply. A table measures each original color's contrast against white and shows all failing. A section describes each rebuild: shapes and labels for the dot plot, gray bars with a labeled highlight for revenue, labeled bands for holidays and a single-hue scale with printed values for wait times. A testing section reports contrast measurements, grayscale reading and color deficiency simulation. Further sections adopt five rules for future charts and flag a public web page. The close explains that color remains but no longer carries meaning alone.
Where the points sit in the BU 454 Unit 6 rubric
Accessibility rubrics at Herzing typically reward identifying color-dependent information, redundant encoding, compliance with a named standard, documented testing and practical rules, with writing and APA. Identification earns full credit when every place color carries meaning is found. Redundant encoding scores highest when shape, position or labels carry the same information. Compliance is judged on measured contrast ratios against the stated thresholds. Testing rewards grayscale checks and simulations with evidence of the results. Practical rules earn points when they prevent the problem from recurring in future charts. Instructors also credit students who keep color where it helps, rather than stripping it out entirely. A short list of rules for future charts is often credited, since it shows the fix will outlast the assignment.
Common BU 454 Unit 6 mistakes, and how to avoid them
Accessibility work often loses points by changing to a colorblind-safe palette while still relying on color alone to separate series. Another common problem is judging contrast by eye rather than measuring it. Students frequently pair red and green for opposite meanings. Some remove color entirely, making charts harder to read for most viewers. Others forget text contrast on axis labels and notes. Many never test in grayscale or with a simulator. Legends that match colors to categories are often left in place when direct labels would work better. Finally, auditing an employer's dashboards for a class paper can cause friction and expose internal material that should stay inside the organization.
Get a BU 454 Unit 6 example written to your instructions
Drop us the Unit 6 instructions with the rubric your BU 454 classroom posts and the charts the assignment asks you to fix. We write a custom example that audits every meaning color carries, runs the grayscale and color vision checks separately, adds a second encoding and cites the standard by version. First custom sample free, returned in 24 to 48 hours.
More BU 454 papers and business analytics samples
- BU 454 Unit 1: Encoding principles exercise
- BU 454 Unit 2: Chart critique
- BU 454 Unit 3: Comparison and ranking charts
- BU 454 Unit 4: Time series visualization
- BU 454 Unit 5: Distribution and relationship charts
- BU 454 Unit 7: Dashboard with hierarchy
- BU 454 Unit 8: Visual report with rationale
- BU 351 Unit 6: Prescriptive or optimization exercise
- BU 407 Unit 6: Transportation model record
- BU 451 Unit 6: Analysis script with output
- BU 453 Unit 6: Joins and aggregation queries
BU 454 Unit 6 questions, answered
Which accessibility standard should the document reference?
Whichever one your instructions or reading name, and cite it with its version rather than quoting a number from memory. Published guidance on contrast and on the use of color differs between documents and is revised over time, so a submission that attributes its threshold is safe while one that states a ratio as a universal fact can be wrong by the time it is graded.
Does this mean I should stop using color entirely?
No, and a set of gray charts usually reads as avoidance rather than as accessible design. Color is a strong channel for grouping and for drawing attention to one series among many. The requirement is that it never be the only thing carrying a meaning, so a reader who loses it still has position, shape or a written label to work from.
My employer's dashboards fail every one of these tests. Can I audit them?
Not in a graded document. An audit reproduces the screens to make its findings, and internal reporting tools carry the company's figures, its customer names and its own design work. Run the exercise on the charts the assignment supplies or on published material from a public body. Anything you learn is yours to take back to work afterward, which is where the audit actually belongs.
Where can I find a free BU 454 Unit 6 sample paper?
The whole BU 454 Unit 6 accessibility and color rebuild is free above, including the contrast measurements, the four rebuilt charts and margin notes. If your charts differ, send them and we will rebuild them to the same standard for free, generally within 48 hours.
Should I stop using color in BU 454 Unit 6?
No. Keep color where it helps, but never as the only carrier of meaning. The sample still uses a blue and vermilion pair, with shapes and labels repeating what the colors show.