Silvia Nieva Departamento de Psicología Básica II EQUIAL- Equipo de Adquisición del Lenguaje. Universidad Complutense de Madrid 28223 Campus de Somosaguas. Pozuelo de Alarcón (Madrid) Spain. Email: silnieva@ucm.es Project Data were collected for Silvia Nieva’s PhD dissertation carried out under the direction of Susana López Ornat (Complutense University) and Sonia Mariscal (UNED), with the support of a Complutense Grant (2007-2011)- This work has been part of the EMERGRAN international project. “The emergence of grammaticality in children: cognitive, linguistic and conversational factors” (2007-2011) Main researcher: Edy Veneziano, CNRS., Paris. ANR: Agence Nationale de la Recherche , France Nº. BLAN06-1-135249 EMERGRAM members: E. Veneziano (IP), CNRS, Paris, France; USA researchers in English: Eve Clark, E. Herr-Israel, Ann Peters, Lorraine McCune. Researchers in French: A. Morgenstern, E. Mathiot, C. Shimanek, C. Rossi, Parisse. Researchesr in Spanish: C. Rojas Nieto (México) y S. Lopez Ornat, S. Nieva (UCM, Equial). The corpus An audio-visual corpus has been collected involving regular sessions of natural interaction of Mendía, a monolingual middle class girl living in Madrid (Spain), whose mother tongue is European Spanish. Data were further transcribed into CHAT format files. The recordings were made between June 2006 and January 2007 (see Table 2) in the context of playing with objects and reading illustrated books for children. Data were recorded with a video camera SONY DCR-HC27 Mini DV at the girl’s home who was accompanied by one of her regular caregivers (mother, father or aunt). The whole corpus contains 32 sessions, corresponding to 21.5 hours of recording. The duration of the recording sessions was an average of 43 '20''. The sessions have been transcribed orthographically, and include extra-linguistic information (gestures, actions and vocalizations). Transcriptions were verified by a second observer. General information and Further Development. First born and only child. Born at term. Birth weight: 11, 23 pounds The girl didn’t suffer from any major illnesses or ear infections. She went to the crèche when she was 16 weeks old, 6 hours per day. No contact with other languages. Parents with higher education college degrees coming from: Mother: Madrid (Spain) (more than 50,000 inhabitants). Father: Salamanca (Spain) (more than 50,000 inhabitants)