The documents only presented Islamic and European perceptions. African or Asian impressions concerning trade contacts would have been helpful. 
Is there additional information that would be valuable?
WHAT’S MISSING?
Let’s look at what kind of information might help us get a better “picture.” Is there a bias that needs to be balanced? Is there something that would make the assessment more accurate?

As we discussed earlier, all of the documents for this DBQ come from Europeans and Muslims describing trade contacts from their point of view. Where are the comments and perceptions of Africans, Asians, Mongols, and Aztecs? It would be interesting to see how their perceptions compare with those of the “outsiders.” Missing information can often provide the source for an effective conclusion.

Note to teacher: Keep in mind that students may develop other interpretations and theses which should be encouraged and analyzed by the class as a whole.