An app developed to help kids with speaking disorders communicate has been pulled from the iTunes Store by Apple due to a lawsuit between the app developers and a hardware developer over patents, either way Apple has removed the app from iTunes, although the Lite version is still available to download.
This is what the Speak for Yourself website has to say about the app;
Vocabulary is based on research of the most commonly used words across age, languages, settings, and situations. Eighty percent of the words that we use to communicate are comprised of a core vocabulary of 300-500 words. This means that approximately only twenty percent of a person’s vocabulary is “personalized.” One hundred and nineteen of these core words constitute the main screen of Speak for Yourself. Each of these buttons links to additional related core vocabulary words and personalized, programmable vocabulary.
Source [Cult of Mac]