According to a survey conducted by The Swedish National Agency for Education in 2000, some form of Content and Language Integrated Learning (CLIL) was already in place or planned in more than 20% of all Swedish upper secondary schools. Some researchers have indicated that English-medium instruction in particular has continued to increase in Swedish schools following the “CLIL boom” from 1992 until 1999, during which up to 15 new CLIL programs commenced every year. However, as there are no recent official statistics on the number of schools offering CLIL and as the term CLIL includes schools with very different degrees of integration of language and subject studies, the actual extent and scope of subject teaching in another language has been difficult to estimate. Because understanding how CLIL has developed since 2000 is key to understanding the context of CLIL in Sweden today, part of a present doctoral study includes a survey of all 908 upper secondary schools offering the nationally recognised degree programs in Sweden. This survey was conducted in order to determine the present extent and scope of CLIL, as well as its growth and decline in the last decade. Preliminary results have indicated the following: single integrated lessons seem more common than an entire program or an entire course offered in another language; many school administrators are unclear about the difference between lessons in modern languages taught in that target language and content lessons taught in a target language; and the International Baccalaureate Program seems to be on the rise in Sweden while CLIL programs appear to be declining. The final results will contribute to the explanation of the development of CLIL and the description of the current CLIL practices in the Swedish context.