Task: Question Answering
Input (English): In contrast to other work, we do not show the documents to the workers at all, but provide only a description of the document cluster's topic along with the propositions. This ensures that tasks are small, simple and can be done quickly (see Figure FIGREF4 ). 
 Question: How were crowd workers instructed to identify important elements in large document collections?
Output (English): provide only a description of the document cluster's topic along with the propositions