大多數評估CLIL學程中，學習者的表現仍多集中在語言的表現。Lasagabaster (2008) 比較了雙語者(在CLIL下學習)和非雙語者(在非CLIL下學習)在標準化測驗下(Cambridge ESOL)下的表現。雙語者本來就有天份和動機，在語言表現(接收技能和產出技能)上比較好是不證自明，但是Lasagabaster (2008) 的研究發現，在非CLIL下的學習者，其學習表現會因為性別和社經地位產生差異；但在CLIL下的學習者，則沒有這樣子的差異。這似乎說明，CLIL是可以跨越性別和社經地位，一體適用的教育取徑。 Ruiz de Zarobe (2008) 比較產出的種類和數量的比例(type/tokens ratio)也是CLIL組的表現較好。
Woodfield and Neofitou (2006) 未出版的學程評估中，則對於語言和內容的表現都進行了評估。同樣透過標準化測驗，在同一個世代中，原本被認為外語學習成是較差的女孩中，有200個女孩比預期的時間更早就達到應有的外語水平；其對於學科內容(地理)的掌握也跟著進步。
由這些證據顯示，CLIL似乎是個可以一體適用的教育取徑。
References
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