When I visited Redmond along with my team this February, we picked this topic and went on discussing it for I don’t remember how many hours. Finally I gave up to dev folks that something that closest to “Not a bug “ is  “By design”. We also went on discussing about “Test error”. Test logging bug due to lack of knowledge. I tend to agree by and large that “By Design“ is something that is close to “Not a bug“. Am I right?

I was happy to see this post by Gunnar K where he talks about the same topic.