Correction codes are symbols the teacher uses when correcting written work. The code tells the learner what type of error they have made, and learners can then attempt to correct their errors themselves, using the symbols to guide them.

Example
The following is an example of correction using a code:
I felt very comfortable in my new house SP (spelling)

In the classroom
Typical codes include WO (word order); WW (wrong word); T (tense); and P (punctuation). Teachers use correction codes to develop the learners' ability to correct and edit their own work, as well as making learning from errors more memorable. However, some learners are either resistant to self-correction or find it difficult.