Sign language is commonly used to teach learners who have difficulties in hearing. In most cases such learners may have complete loss hearing. However, sign language may differ from country to country making it difficult to have uniformity in the use of signs or symbols. There could be some of learner and instructor factors that affect the former's perception of the sign language.
@Anthony G Gordon - that was tried (Gestuno) and didn't catch on - because artificially constructed languages are clunky and unnatural to use. International Sign is a pidgin that is used in international settings, such as Deaflympics and WFD meetings. It has a limited lexicon. Unfortunately (from a cultural diversity / integrity perspective), ASL has become the default sign language in many developing countries, stemming from well-intentioned missionaries....
@David Wafula Lwangale - not sure what you mean by 'perception' there - it sounds like you're referring to language acquisition? In which case, sign languages are the same as any spoken languages - key factors in acquisition include access to fluent language models (rather than 'instructors' per sae), and opportunities for expression. The limiting factor for many Deaf children is environmental - they are often isolated and don't have access to fluent language models. The variation between different sign languages is not a limiting factor in itself.
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