IRCT2016071726083N1 IRCT 2016-07-17 tehran University of Medical sciences efficacy of focused language treatment and working memory training on some of the components of grammar in children with cochlear implant Comparison of efficacy of focused language treatment and working memory training on some of the components of grammar in children with cochlear implant 2016-05-21 anticipated 15 Complete https://irct.ir/trial/21713 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment, Other design features: Parallel allocation; Randomized using sealed envelopes. N/A hearing loss. Intervention 1: Intervention group 1: language intervention for5 weeks (25 days) - each session is 30 to 45 minutes- Will be implemented in partnership with parents.Method of treatment in this group include modelling and focused stimulation on comprehension and expression grammar. Mothers will trained how to intervene by therapist. Intervention 2: working memory intervention for5 weeks (25 days)- each session is 30 to 45 minutes- Will be implemented in partnership with parents.method of memory enhancement is providing auditory stimuli such as the retrieval number, word, sentence. Mothers will trained how to intervene by therapist. Intervention 3: Control group: routine speech therapy they receive.