The Word Mapping Formula
Have you ever asked yourself how you would map a word when supporting a child who cannot yet read or spell it? Which letters are the graphemes? Which sounds do they represent? Is there a formula for calculating this? Yes!

Before asking Reception and Year 1 teachers to split words into syllables, teach syllable types, spelling rules or use other ‘structured literacy’ type activities, we need to establish whether teachers can map any word they encounter into phonemes and graphemes, as expected by the education department.
If they can, they may not need to do anything more than support bidirectional word mapping, and use activities such as the 60 Second Spelling Routine to bond phonemes, graphemes and meaning in the orthographic lexicon. Every child self-teaching before Grade 2.
‘Get in. Get out.’ As much explicit instruction as they need, and no more. We need to reduce the explicit instruction needed, not add to it.
Adding morphology, looking for ‘vowel sounds’, teaching the history of words, etc. may be information children don’t need in order to move into self-teaching and towards orthographic mapping.
This isn’t an argument for ignoring morphology. Morphology can complement word mapping. The issue is when these strategies are employed because the children aren’t able to map words, and because the adults can’t either. It’s often why they go looking for something else.
Before adding more information for children to learn, we need to establish whether teachers themselves can do what the education department expects: identify the phonemes in words and the graphemes that represent them, and support children to make those connections bidirectionally.
Add Word Mapping Training to your calendar for 2027.
The Bidirectional Word Mapping Formula
Word mapping connects the phonemes in a spoken word with the graphemes in its written form. The formula works in both directions.
Decoding: print to speech
Written word → identify the graphemes from left to right → say the phoneme represented by each grapheme → blend the phonemes → say the word
This reflects the Department for Education’s description of decoding:
“In reading, pupils are taught to decode by identifying graphemes in written words from left to right, saying the corresponding phonemes, and blending those phonemes to say the whole word” (Department for Education, England, 2023, p. 47).
The Standard will depend the relevant jurisdictional standard, for exmple:
-
US English.
TheAlphabeticCode.com
Encoding: speech to print
Spoken word → identify and segment the phonemes in order → select a grapheme to represent each phoneme → write the word
This reflects the Department for Education’s description of spelling:
“In spelling, pupils are taught to say a word clearly, segment it into phonemes, and select graphemes to represent each phoneme in writing” (Department for Education, England, Writing Framework, 2025, p. 41).
The Standard will depend the relevant jurisdictional standard, for exmple:
-
US English.
TheAlphabeticCode.com
Three students mapping a word may produce three plausible pronunciations. Had they known the word, they could have applied Set for Variability.
But ask teachers, who do know the word, to map that same word and what happens? Which letters do they identify as the graphemes, and what sound values do they assign to them?
We can’t even talk about teachers mapping words ‘correctly’ or ‘accurately’ unless there’s an agreed Word Mapping Standard against which those decisions can be checked.
That’s why Emma Hartnell-Baker MEd SEN developed the Word Mapping Formula: to provide a consistent way of calculating how the phonemes and graphemes map in a word, according to the expected standard in each jurisdiction, before adapting that mapping where necessary for the child’s accent.
We spend an enormous amount of time analysing what orthographic learners know and do. I think we need to start asking the same questions about the phonological–orthographic knowledge of the adults teaching them.
It’s what Emma Hartnell-Baker is researching in England: how do phonics-trained teachers actually map the alphabetic code?


If you know which letters are the graphemes and their sound value you can model the 60 Second Spelling Routine.
You will also understand the IPA aligned 'Phonemies'!
