Useful knowledge

Useful knowledge is a criteria for information that depends on following factors:1.Relevance to current environment: does the information require a specific environment to be relevant or its more general type?2.Skill to decipher: does the information require specific skills to use or it allows interpretation by a layman.3.Specificity of knowledge: does the information focus on very specificideas and concepts, without general applicability?4.Unmentioned context: does the information make sense with a specific context?5.Jargon: does the information require knowing specific jargon?