This review examines the subject under five sub-headings: writing intent, writing structure, Type of techniques, vocabulary, and spelling observation. Of these, the structure of the text is examined under two sub-headings, external structure and internal structure. Among the 32 writing techniques mentioned by Tolkappiyar, 1. Writing purpose, 2. Section order, 3. Codification expression, 4. Section expression, 5. Semantic coordination, 6. Fictional gestures, 7. Meaningful reference, 8. Alternative formula entry, 9. Future reference, 10. Sutra and examples are examined in bilingual grammars. In formulaic construction methods such as sutrartham, sutra structure, relation between sutras, gana, nipatam are taken into consideration. In the alphabet section, topics such as distribution of letters, creation of letters, conjugation, and word usage are examined. Finally, at the end of the character the 10 things identified in the bilingual grammars examined comparatively are revealed and the table of reference is compiled.