In this contribution a description is given of the modules developed for implementing Dutch prosody, and more in particular an autosegmental description of Dutch intonation in the rule-based Text-to-Speech system NIROS: Nijmegen Interactive Rule Oriented Speech synthesis. Our TTS systeem is completely syntax directed; the synthesizer part is based on a serial pole-zero (ARMA) structure [9]. In NIROS a multi-layer datastructure [6,12] is used reflecting the intuitive notion that speech is organized at serveral levels both segmental and suprasegmental. By letting rules work on the different layers (datastre-ams) of this datastructure the input of the synthesizer is prepared. Emphasis is given both to the multi-layered datastructure, and to the two compilers used in NIROS to manipulate data: the FONPARS rule compiler for handling monolayered datastructures, and the compiler ALF-EIOS for multilayered data. Keywords: text-to-speech, prosody