Donut and pie charts allow grouping and subgrouping. Grouping creates two or more separate pie or donut charts that display in rows or columns on one graph. Subgrouping creates a separate ring of ...

The little pie charts are difficult to read and we’ve lost the dominance of Facebook. Also, the only chart used is a pie chart and neither pie charts nor donut charts communicate very well.

Figure 2. Arrow chart used as an alternative to the multiple pie charts. The base of the arrow is the 2002 budget and the arrowhead points to the 2003 budget.