**1. Introduction**

48 Learning Disabilities

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In this chapter, a brief of three studies relating attention deficit and hyperactivity disorder (ADHD) and writing Learning Disabilities (LD) is presented, all of them following a research line. First, we carried out an experimental study on attention and writing with normally developing students, investigating the effects of the use of a graphic organizer and a time interval register processes in writing composition. Second, we selected four samples of students, one group of students with ADHD and LD, one with ADHD without LD. The third group comprised students with LD, and the last group was made up of normally achieving students. Those groups were matched for age and educational level, and we evaluated variables of attention, working memory (first comparative study), and also the processes and the product of writing composition including the orchestration (second comparative study).

We reviewed the previous empirical studies that served as background work. From this review we found that there are only a few published research studies that analyze the overlap of the presence of ADHD and LD in writing, as well as the need to study the relationship between attention and writing in normally achieving students. Besides, it was found a paucity of knowledge regarding the relationship between ADHD and writing LD. It is also pertinent to briefly conceptualize, ADHD and its various presentations; LD in writing; and the existing studies about the overlap of ADHD and LD in writing.
