No Purpose Pie Chart Picture Flickr

Pie charts are a horrible way to convey information, particularly when other formats are much more effective.

Stephen Few has a compelling article explaining why this is true.  I also recommend his books.

If you need a little convincing before reading the whole article, open the pdf and skip to the bottom of page 11.  That pretty much sums up the situation.

Picture credit to hunsonisgroovy on Flickr