Pseudo natural language vs. controlled natural language

Natural language is an indispensable means of communication. But it is also a serious barrier for communication, in particular between human and computers. Efforts have been made to overcome this barrier since long time ago. One of these efforts was to design controlled natural languages (CNL), which are subsets of natural languages, yet are easy to use for non-native users and can be processed by computers. First results of CNL for practical use were published in 2006-2007. On the other hand, we have designed and used another kind of limited natural language-the Pseudo Natural Language (PNL) since late eighties, which have been put in use successfully and have shown their ability of helping overcome the language barrier. This talk will compare CNL with PNL in detail and discuss future direction of this area.