I know diglossia = a situation in which two languages (or two varieties of the same language) are used under different conditions within a community, often by the same people. The term is usually applied to languages with distinct “high” and “low” (colloquial) varieties, such as Arabic, and even 'high' and 'low' German.
I found this in Wikipaedia:
Suggestopedia is one of the teaching methods developed by Bulgarian psychotherapist Georgi Lozanov based on the study of Suggestology. The method has been used in different fields of studies but mostly in the field of foreign languages learning. Lozanov claimed that by using this method one can teach languages approximately three to five times as quickly as conventional methods.
The theory applied positive suggestion in teaching when it was developed in the 1970s. However, as improved, it has focused more on “desuggestive learning” and now is often called “desuggestopedia.”  Suggestopedia is the latest of the six major foreign-language teaching methods known to language teaching experts (the oldest being the grammar translation method.) The name of Suggestopedia is from the words “suggestion” and “pedagogy.”
Suggestopedia is one of the few methodologies working with relaxation. The Michel Thomas Method is the other major user. Mainly based on the discovery of the mirror neurons Ludger Schiffler (2003) has developed the interhemispheric foreign language learning, using gestures and the mental visualization of the gestures during the relaxation period.
- For Teachers