The Thai Discourse Analysis Project seeks to provide a description of linguistic structures of importance in understanding the nature of Thai speech. Previous studies have been limited, and restricted to consideration of the written language and "literary" speech. The project consists of three phases: the acquisition of recorded texts, transcription and other preliminary processes, and selection and utilization of representative materials for analysis of linguistic structures and pedagogical application. Tape-recorded speech thus constitutes the principal data source, and native Thai speakers served as informants. A subsidiary phase of the project showed that students of Thai made significant gains in passive language abilities after intensive exposure to taped speech examples. A cassette recorder was used to tape a wide range of Thai, such as formal speeches, official interviewing, media presentations, guided tour commentaries, extemporaneous discussions and conversation. Some findings are briefly indicated, regarding Thai lexical units, modal auxiliaries of the preverbal type, principles organizing placement of noun phrase groups with respect to governing verb phrase units, and phrase/sentence aspects of unit definition. The main part of the paper discusses linking in Thai discourse, from a sociolinguistic view and as related to text environments, reiterative schema and feedback. (CHK)