One of his rules says "Good results should go up on the Y axis. This means that if you're charting weight loss, don't chart "how much I weigh" because good resu

One of his rules says "Good results should go up on the Y axis. This means that if you're charting weight loss, don't chart "how much I weigh" because good results would go down. Instead, chart "percentage of goal" or "how much I lost." " A graph that needs to track weight loss should chart weight loss, but imo it isn't a good idea to say that good results should always go up on the y axis. If I were interested in tracking weight, I'd rather have a graph track the actual "weight" instead of some other convoluted metric like "how much I lost". Weight going up may be a "bad" result for some users and it may be a "good" result for other users. So it wouldn't make sense for a weight-tracking for a graph to categorize it as good or bad http://blog.CascadeSoft.net/2009/07/05/product-ui-design-why-the-green-up-arrow-isn’t-always-good/ http://blog.CascadeSoft.net/2009/07/05/product-ui-design-why... also addresses this topic.