The key to writing good notes is to

The key to writing good notes is to record as many details as possible. This is why it is important to make your notes right after you observe something, before you start forgetting the details. Record information that you receive with all your senses, not just what you see. If you hear or smell something unusual, it could be important later on. It is better that you write too much instead of too little, as some information may end up being more important than you realize. For example, someone may try to distract you by telling you that there is a problem in the parking lot, meanwhile a robbery is taking place inside the building. If you have a clear description of the person who told you about the problem in the parking lot, it may be helpful during an investigation.