Many students struggle with handwriting – you can see the labor in each
letter they write or the illegibility of letters. Non-fluent readers
often struggle with comprehensions.  Non-fluent hand-writers often
struggle with the writing process. If handwriting is difficult it will
impact the writing process.  Just like reading has fluency benchmarks so
does writing.  Below is a chart from a 2008 article – What to Improve
Children’s Writing? – Don’t Neglect Their Handwriting, by Steve Graham.