Working memory and ADHD

Summarize the recent developments in the area of working memory.  

Describe how working memory is hypothesized to affect people with ADHD.  

What has the research shown?  

What do you think is going on?  

Describe the merits of working memory training that is popping up to address deficits in working memory in people with ADHD. And finally, how does stimulant medication work for people with ADHD?