When I was in high school, a class that I was in was given a writing assignment. This was a type of class that ordinarily wouldn't have writing assignments and so the students were a little unsure as to the requirements. One of my classmates asked, "How long should the paper be?" And the perverted old man replied, "The paper should be like a woman's skirt: long enough to cover the subject but short enough to still be interesting."
Today I want to expound upon effective defect reports. I am an absolute stickler for detailed defect reports. I have no problem sending issues back that don't have sufficient information. Defect reports are adult writing assignments and we need to make sure that we are including all of the necessary information. I could run down my list of criteria that I expect in every bug report, but you can find those types of lists lots of places. Besides, the list, like everything in testing, is context-oriented.
As inappropriate as my teacher was, he did imply an important point: it's not about a measurement, it's about accomplishing a purpose. Skirts, and clothing in general, maintain a certain level of modest, protect us from the elements, and evoke intrigue. Defect reports, must be able to fulfill two very important functions, otherwise they are a failure.
An effective defect report makes reproduction and troubleshooting as simple as possible.
More often than not, the person who discovers the defect is not the person who resolves the defect. This is a simple efficiency issue. If you have a PM or Scrum Master reviewing issues, they need to be able to assess the priority and assign the issue to the most appropriate developer. The developer should be able to understand what's going on without having to guess or ask additional questions so they can spend less time identifying the issue and more time fixing.
An effective defect report archives the defect.
The purpose of this is for testing. Often times, the person who discovers the defect is not the person who verifies that it has been fixed. The tester needs to be able to know exactly what was wrong so that when they test the resolution, they can determine beyond a doubt whether or not the defect is fixed. If the tester doesn't know precisely what was wrong, it's impossible to know if it's fixed.
If your bug reports fulfill those functions then you're well on your way to getting an A+ on your writing skills. Remember, context is everything - sometimes bug reproduction is elusive and sometimes a conversation can convey imporant information that is hard to express in text. If you keep mind of the purpose then the details will fall into place.