The Contrastive Analysis Hypothesis (CAH) was born before the

establishment of the idea of interlanguage, claiming that learner

language was solely created by transfer from their native language

(NL). Error analysis was created then so as to validate the

predictions of the CAH by studying learners’ production. Errors were

considered “interferences” between the two languages. However,

some researchers soon found out that there were errors that did not

come from transfer. LOOK BROWN

Corder developed an alternative framework with the concept of

transitional competence, which was an intermediate stage

between the NL and the TL. He also claimed that the NL can

positively affect the acquisition of the TL if both languages have

similar patterns and that errors represent the difference between the

learner’s transitional competence and the TL.