- The foci of GLOTTOTHEORY are: observations and descriptions of all aspects of language and text phenomena including the areas of psycholinguistics, sociolinguistics, dialectology, pragmatics, etc. on all levels of linguistic analysis; applications of methods, models or findings from quantitative linguistics concerning problems of natural language processing, language teaching, documentation and information retrieval; methodological problems of linguistic measurement, model construction, sampling and test theory; epistemological issues such as explanation of language and text phenomena, contributions to theory construction, systems theory, philosophy of science.