The first think we should consider is the subject that we are going to teach because depending on the type of CLIL instruction, we will focus on the language, on the content or on both at the same time.
Here you have a clarifier graphic where you can see the importance of each of the points.
In the variant A (CLIL in subject lessons), it is given more relevance to the contents of the curriculum of the subject. English is just used as a vehicular language. However, in the variant B (CLIL in foreign language lessons), the most important thing is the language and contents are the means through students develop their language skills. Last, we have variant C (balanced CLIL) where both items are considered at the same level.
As Massler, Stotz & Queisser (2014) explain, the way as the teacher should assess in each case is completely different.
If I used variant A, I would base the assessment on the subject curriculum using different tools such as tests, writing development explanations or oral questions. I would use the foreign language just as a way of communication the knowledges.
In the case that I teach variant B, I would base the learning aims on the language, specially doing activities to practise the four skills: speaking, writing, listening and reading. The main objective will be acquire the communicative competence in the foreign language.
Supposing that I was using variant C, I would focus on the curriculum and on the language. The idea is to mix both in a fully integrated teaching and learning process. For doing that, projects can be very useful in where we can assess all the aspects considered using rubrics.
The next point we must take into account is the kind of assessment we are going to implement. According to Assessment in CLIL, there are three different types of assessment depending on when we evaluate the students.
The diagnostic assessment is made at the beginning when you start teaching in order to check the level or the abilities of the pupils. Then, we have the formative assessment, which is realised during the learning process for being sure that students are going on and understanding new knowledges. Finally, we have the summative assessment that is accomplished at the end to get a final information about the goals achieved.
In conclusion, using CLIL offers a wide range of possibilities of teaching adapted to the needs of the students and can have great results in their learning.
Bibliography:
Assessment in CLIL (Cefire)
Massler, U.; Stotz, D. & Queisser, C. (2014) Assessment instruments for primary CLIL: the conceptualisation and evaluation of test tasks, The Language Learning Journal, 42:2, 137-150.


