The study was made by Virginia Berninger, a University of Washington professor of educational psychology who studies typical writing development and writing disabilities, looked at children's capacity to write the alphabet, sentences and essays using a pen and a keyboard.

It was seen that children's writes better wit a pen when they write essays. They wrote more sentences in faster manner. Keyboard was better than the pen only for writing alphabets.For making sentence the results was mixed.

All the children's three grade levels created longer essays when using a pen. The complete sentence is made by the fourth and sixth grade children's in a faster rate. The capacity to write complete sentences was not exaggerated by the children's spelling skills

Children first have to be aware of what a sentence or a complete thought is before they can write one, Berninger said. Talking is very different from writing. We don't talk in complete sentence. In conversation we make units smaller and larger than sentences.