Contextual documentation is an information block approach to writing in-situ documentation. 
It becomes particularly useful when dealing with in-situ documentation delivered to the software GUI, to devise a matrix of required help to users in a particular situation or context. 
This concept is based on DITA, where small topics are written when needed asking the right questions:
This is an editorial matrix, a content guideline as sorts. By no means are all items to be written exhaustively as if they were a form to be filled
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