1) The document discusses similarities between three linguistic schools: Hjelmslev's Glossematics, Lamb's Stratificational-Cognitive Linguistics, and Halliday's Systemic-Functional Linguistics.
2) Key similarities include their basis in Saussure's dichotomies, aim for descriptive adequacy, status as post-Bloomfieldian, adoption of formal syntax, view of language as incorporating non-linguistic phenomena, and use of progressive deductive analysis.
3) All three schools represent language as a relational network organized into strata, with primary linguistic strata and sometimes peripheral extra-linguistic strata, and analyze relationships between elements