make the language easy to learn for not only the Deaf but for both interim management and an everyday observer. IS interpreter Bill Moody noted in a 1994 paper that the vocabulary used in conference settings is largely derived from the sign languages of the Western world and is less comprehensible to those from African or Asian sign language backgrounds. A 1999 study by Bencie Woll suggested that IS signers often use a large amount of vocabulary from their native language, choosing sign variants that would be more easily understood by a foreigner. In contrast, Rachel Rosenstock notes that the vocabulary exhibited in her study of International Sign was largely made up of highly iconic signs common to many sign languages:Over 60% of the signs occurred in the same form in more than eight SLs as well as in IS. This suggests that the majority of IS signs are not signs borrowed from a specific SL, as other studies found, but rather are common to many natural SLs. Only 2% of IS signs were found to be unique to IS. The remaining 38% were borrowed (or "loan") signs that could be traced back to one SL or a group of related SLs. International Sign has a simplified lexicon. In IS for example, the English who, what, and how are all translated simply to what. Another example of this simplified lexicon is the location of the sign itself. IS will use movements on the chest to indicate feeling signs, and signs near the head will indicate cognitive activity. There have been several attempts at making dictionaries for IS. However, these lack detailed information on data collection, nor do they describe the exact meaning or how the signs should be used. This causes difficulty for training and teaching people in IS, as there is no empirical evidence. Manual alphabet The manual alphabet of IS belongs to the French family of manual alphabets, specifically in a subgroup around to the modern American manual alphabet. However, some letters differ in a few finger positions to the American alphabet. IS numbers larger than five are, unlike in ASL, performed by two hands. Grammar Very little is known about the grammar of IS. It tends to use fewer mouthings and often has a larger signing space. The use of mouth gestures for adverbials is emphasized. People communicating in IS tend to make heavy use of 1)