Being that Zach is 28 months old in the 'Zachy 2;4 drawing a banana' transcript we would commonly expect to see the telegraphic stage of the child language acquisition but however we are already seeing sings of the multi-word stage. For example, "I got food on the floor" would be evidence in proving that Zach has started to enter the multi-word stage, as we would expect him to be in the telegraphic stage we would expect to see hum using a similar phrase like "got food floor" as an alternative. This contradicts Piaget's theory and idea that children cant advance their language unless they go through the 4 stages and have reached a certain age.
Looking at Halliday's and Dore's child language functions, ive noticed that throughout the first transcript the function answering (responding to an utterance of another speaker) is more common and apparent as well as him often using the imaginative function. For example "Its got lots of hurt all the way down (.) so i put lots of (0.5) sellotape on it (.) so it could feel better". Compared to in the second transcript where the functions requesting an action and protesting are more frequent. An example of Zach requesting an action is when he says "please can you pick it up","can you do it mummy?" and when he says "we cant (.) we'll just have to wait an wait an wait".
In the time between the first and the second transcript Zach as also developed polite forms which also shows how much is language has developed and is continuing to do so like i stated above, such as "please" and "thank you". Children learn and develop manners from those around them specifically their main care givers which is exactly what has happened in Zach's case. When his mother says "you might need the magic word then" Zach instantly responds with "please" showing he understand what the magic word means and what he is being asked to do. This also shows that his mother formed his understanding of the correct words he must use when he is asking for something, being "please" and using the polite expression "thank you".
Comparing both of the transcripts together Skinner’s operant conditioning theory of positive reinforcement could be applied to both and how Zach's mother is encouraging him to proceed with his language development and to continue repeating what he is doing well. For example, phrases such as "well done”, “very good” are used by his mother to applause him and praise him. By using positive reinforcement in both of the transcripts its helped to enable Zach's use of language to develop and continue to expand to a greater extend. This will ensure that Zach knows what he is doing well and give him that extra boost to continue the way he is doing so.
In the time between the first and the second transcript Zach as also developed polite forms which also shows how much is language has developed and is continuing to do so like i stated above, such as "please" and "thank you". Children learn and develop manners from those around them specifically their main care givers which is exactly what has happened in Zach's case. When his mother says "you might need the magic word then" Zach instantly responds with "please" showing he understand what the magic word means and what he is being asked to do. This also shows that his mother formed his understanding of the correct words he must use when he is asking for something, being "please" and using the polite expression "thank you".