The eight children were observed by three research students. Patricia Man recorded Bohuen and Gakei; Alice Cheung observed Bernard, Tsuntsun and Tinfaan; and Kitty Szeto followed Johnny, Jenny and Chunyat. The names of the children and the ages during which they were recorded are as follows: Name Sex Age at which recording began and ended No. of files Bohuen (wbh) F 2;03;23 - 3;04;08 27 Gakei (cgk) F 1;11;01 - 2;09;09 19 Bernard (mhz) M 1;07;00 - 2;08;06 26 Tsuntsun (ckt) M 1;05;22 - 2;07;22 25 Tinfaan (ltf) F 2;02;10 - 3;02;18 16 Johnny (hhc) M 2;04;08 - 3;04;14 16 Jenny (lly) F 2;08;10 - 3;08;09 20 Chunyat (ccc) M 1;10;08 - 2;10;27 22 The file name indicates the name of the child and his/her age at the time of the recording. Each filename is made up of the initials of the child (the first three characters) and his/her age at the time of recording, in terms of Year (1 character), Month (2 characters), and Day (2 characters). Depending on the version of the corpus one uses, the files may have the suffix 'cha' or 'tag'. For instance, the file WBH20322.cha contains tagged utterances of Bohuen (whb) when she was 2 years 3 months and 22 days old.