Readers have to follow an author’s lead, using their knowledge of a topic to draw inferences or to fill gaps that the author leaves. The writer, on the other hand, has to be able to initiate the “conversation,” which requires a greater degree of explicitness and a more thorough and complete grasp of the same information...Knowing a topic well enough to read about it successfully pales before the more onerous demands of writing- more extensive and better organized knowledge is required for someone to write about it with sufficient depth. Similarly, it has been shown that there are different, though overlapping, cognitive paths from sound to letter than from letter to sound; spelling and decoding are not just mirror images of each other.
Shanahan (2019, p.310)
