
Working memory is the ability we have to hold and manipulate information in the mind over short periods of time. It is also known as ‘short term memory’. When we first perceive something, it is ‘worked on’ in working memory (short term memory). This is called encoding. Memories have to be encoded before they can be stored in long-term memory.
Working memory is important because it provides a mental workspace in which we can hold information whilst engaged in other activities. The capacity to do this is crucial to many learning activities in the classroom. Children often have to hold information in their mind whilst engaged in an effortful activity. The information to be remembered may, for example, be the sentence that they intend to write while they are trying to spell the individual words. It could also be the list of instructions given by the teacher while carrying out individual steps in the task.
It is suggested that because children with weak working memory often fail to meet working memory demands of individual learning episodes, the incremental process of acquiring skills and knowledge over the school years is disrupted.
Working memory plays an important role in reading comprehension and, for younger children, in the development of decoding skills to create reading fluency. It is a measure of the capacity of individuals to hold information in mind with the purpose of completing a task and helps them to remember the rules within a game or task.

How do I know if my child has poor working memory?
Well, this area is normally assessed by an Educational Psychologist when they look at the child's overall cognitive ability. However, there are some functional implications that you can observe aswell:
Difficulty retelling a story using own words.
Incomplete recall, such as forgetting some or all of the words in a sentence, or of a sequence of words
Forgetting instructions, including remembering only the part of a sequence of instructions, or forgetting the content of an instruction
Place-keeping errors – for example, repeating and/or skipping letters and words during sentence writing, missing out large chunks of a task.
Task abandonment – the child gives up a task completely.
Difficulty remembering the details of activities with more than one step.
Difficulty remembering place within a complicated task