Writing letters and words is the physical and cognitive act of producing written language -- forming letters by hand, copying words, and using invented spelling to write words independently. It is the productive counterpart to reading: while reading translates print to speech, writing translates speech to print. Early writing depends on letter-sound knowledge (hearing /k/ and writing "c") and fine motor control (holding a pencil, forming letter shapes).
Begin with large motor movements (writing letters in the air, on whiteboards) before progressing to pencil and paper. Teach letter formation explicitly -- correct starting points and stroke order prevent bad habits. Encourage invented spelling ("I heard /k/ /a/ /t/, so I'll write c-a-t") as a bridge to conventional spelling. Provide meaningful writing tasks: labeling drawings, writing names, making lists, and writing simple captions.
Writing letters and words is the flip side of reading: while reading decodes print into speech, writing encodes speech into print. You already know from your work on letter-sound correspondence that each letter (or letter combination) maps to a sound. Writing asks you to run that mapping in reverse — to hear a sound and remember which letter shape represents it. This is harder in one important way: when reading, the print is there to give you clues; when writing, you must retrieve both the sound-to-letter mapping and the physical form of the letter from memory, then coordinate your hand to produce it.
The physical act of letter formation is more cognitively important than it might seem. Research on handwriting shows that forming letters by hand activates different and broader brain regions than typing or tracing. When children write letters by hand, they are reinforcing the visual memory of letter shapes in a way that actually supports reading. This is why explicit letter formation instruction — learning the correct starting point and stroke order for each letter — matters: consistent formation builds the automatic visual templates that help the brain recognize letters rapidly during reading. A child who writes "b" correctly (starting at the top, drawing down, then adding the bump) is reinforcing exactly the features that distinguish "b" from "d" and "p."
Invented spelling is one of the most important concepts in early literacy development, and it often surprises adults who assume children should only write words they can spell correctly. When a child writes "SPDR" for "spider" or "KAT" for "cat," they are demonstrating active phonological analysis: they are listening to the sounds in the word, mapping each sound to the letter they know for it, and producing a written record. This process is extraordinarily valuable — it strengthens phonemic awareness (the ability to isolate individual sounds in speech), consolidates letter-sound knowledge, and gives the child agency as a writer before formal spelling is mastered. Correcting every invented spelling prematurely can actually slow literacy development by shifting the child's attention from sound analysis to rote memorization.
Writing also serves a communicative and meaning-making function from the earliest stages. Even before children can write conventional words, many understand that marks on paper carry meaning — this is the foundation of print awareness. As they move from scribbling to letter-like forms to actual letters, children are building the understanding that writing is a stable, reproducible code that preserves meaning across time and space. Meaningful writing tasks — labeling their own drawings, writing their name, making a list of favorite animals — connect the mechanics of letter formation to this communicative purpose. The goal is for children to understand writing as a tool for meaning, not just a copying exercise, because that motivation drives the practice that builds automatic, fluent letter production.