People with disabilities might have difficulty with the cognitive or the physical process of writing. In addition, they may have difficulty spelling, which can manifest itself in letter reversals, letter transposition, and omission of letters or words. Individuals may be hindered in the physical process of writing, making it difficult to fill in blanks, bubble in dots, line up numbers or words in a column, on a line, or within a margin. Handwriting may be illegible. Organizing a written project, identifying themes or ideas, structuring sentences or paragraphs, or identifying and/or correcting grammar errors may all be writing tasks that are problematic due to deficits in the cognitive process of writing.