To check criterion-validity we will compare the Finnish PF-observation and American CLASS-observation. Both observations will be conducted in the same groups. Yasmin Fong from the Education University of Hong Kong visited Finland to train four observers. Now we have four observers licenced to do CLASS-observations in Finland. It will be interesting to compare the Finnish PF with the American Class. Furthermore, it will be even more interesting to compare Finnish and Hong Kong Early Education based on the two observation methods. Yasmin will train Hong Kong observers to use also PF in Hong Kong. The picture is from CLASS training with Roosa-Maria Laaksonen, Mari Sillman, Yasmin Fong, Jenny Hietanen and Jouni Veijalainen.