Valter Tauli considered interlinguistics as a subdiscipline of language planning.[13] The principles recommended by him for language planning applied to the guided development of national languages are also, and more liberally so, applicable to constructed interlanguages. It is noteworthy that these principles have close counterparts among Grice’s conversational maxims. These maxims describe how effective communication in conversation is achieved, and in order to function well, a language must be such that it allows respecting these maxims, which languages not always do.[14]