• Nice search functionality
• Simple colors (though maybe tough for color blind people)
• The table clearly show the top 10 countries
• Being able to "Play" the visualisation and watch the map change
• Really nice tooltips
• Clicking on a country give you specific information about each of the rankings for that country

• The filled map makes it hard to see small countries and especially to see how they change.
• The up/down arrows next to the numbers clearly show better or worse, but compared to what?
• There's no sense of change because you can't easily compare years.

• I knew I didn't want to use a map, so I wanted to focus on other chart types.
• Verify which countries had data for which years
• Limit the data to only years 2000-2015 and to those countries that had data for all of those years
• Provide the user with an option to swap out for a different metric
• Provide context for all countries against each other
• Allow the user to select a country to highlight

• Resizing the continents by their overall exports makes it obvious that Europe is the largest exporter.
• I hate packed bubbles, however in this view, the largest countries stand out by double encoding with color.
• Including the percentages for each continent provides needed context

What could be improved?

• The packed bubbles make comparisons overly difficult.
• The color legend uses unequal intervals.
• Plotting the data on a map doesn't add any context.
• There's no sense of overall ranking across all countries.
• If you ask "so what?", there's no answer.

1. Has an informative title and subtitle
2. Provides context
3. Provides insight
4. Uses color effectively

• Simple title and subtitle
• Noting when he combined countries
• Simple filtering
• Nice small multiples design
• Including summaries under each country name
• Sorting the countries from most medals to least
• Including blocks for each medal won

• Right-align the filter titles so they are next to the filter itself.
• I'd prefer the gold medals at the bottom and bronze on top.
• Provide an option to look at the top N countries so that you can see it one screen.
• The x-axis doesn't make sense. If it's supposed to represent a year, why does it start at zero and end at 25?

• Focused the visualisation on the cumulative medals won by the top 5 countries based on the filters; I did this by creating stepped lines based on Rody's tutorial.
• Made the x-axis represent the number of years since a country first participated in the games; this makes comparing the cumulative medals easier. In other words, it's easier to see which country won medals the fastest.
• Place the filter titles above each filter
• Moved the notes to the bottom, out of the way
• Simplified the tooltips

• The x-axis is labeled every 10 years starting with the first year in the data set. This works well since there are 70 years in the data set.
• Labeling the y-axis for every 20% keeps that axis from getting too cluttered.
• The title is straight to the point.
• Placing the legend in the middle of the graph allows the chart to use the entire space.
• Stacking "White" on the bottom is a good choice since it's always the largest segment.

• As it's stacked bars, it's harder than necessary to determine the percentage that Black and Latino comprise since their position is influenced by the colors below them.
• The bars appear to be of differing widths and that makes it look a bit blurry to me.
• An area chart would be much easier to understand.
• Consider more distinct color choices, particularly for White and Black.
• The visualization doesn't flow well with the accompanying story, which was about the increase in blacks and the more recent decrease. There's no indicator to the audience that this is what the chart is about.