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Diagnostic  Evaluation of Articulation and Phonology
The DEAP is a test that assesses children’s speech and is used with children from the age of 3yrs. Whilst the DEAP has five subtests, the LOCHI study is only using one of these, the phonology subtest. This subtest examines how children say all of the sounds in English in isolated words.
It is important that the speech pathologist is able to elicit your child’s spontaneous production of the target word. To do this, the speech pathologist will ask your child questions in a specific way. Firstly the speech pathologist will try to elicit the target word by saying “What is this?”. If your child does not respond to this, the speech pathologist will give your child a clue without saying the target word, e.g. “you need this to protect you from the rain”. If you child does not respond, the speech pathologist will ask your child to choose the correct word e.g. “is it an umbrella or an elephant?”. The target word is always the first choice in the sentence so if the child responds, he is not directly imitating the word that has just been said. If your child doesn’t respond to this, the speech pathologist will ask him to directly imitate the target word e.g. “say umbrella”.
The DEAP also looks at the accuracy of your child’s speech by calculating the number of sounds your child produced correctly out of all the sounds in the test. There are three measures used – percentage consonants correct (PCC), percentage vowels correct (PVC) and percentage phonemes correct (PPC). The DEAP has been administered to a large number of Australian children so it is possible to view your child’s performance in relation to his peers.