T.C.
In severe cases this can be caused by a disability called dysgraphia. My son has this(it happens commonly with Aspergers). He has had occupational therapy, which helped a bit. Even in 3rd grade, his letters are backwards, oddly shaped, and unevenly sized and spaced. When he is working one-on-one with the therapist on special paper, he can produce neat work. But in the regular classroom and when doing homework he cannot keep up, show what he knows, and produce work at his grade level. His teacher often has him answer verbally and then writes for him. At home, I let him type his homework unless the handwriting itself is going to be graded. There is a yahoo discussion group that has been very helpful. http://groups.yahoo.com/group/dysgraphia/