Compared to reading comprehension based QA (RCQA) setup where the answers to a question is usually found in the given small paragraph, in the OpenBookQA setup the open book part is much larger (than a small paragraph) and is not complete as additional common knowledge may be required.  
 Question: How is OpenBookQA different from other natural language QA?
in the OpenBookQA setup the open book part is much larger the open book part is much larger (than a small paragraph) and is not complete as additional common knowledge may be required