The themed list problem
Spelling lists are very often built around a topic — ten words about the Romans, ten about the weather, ten from the book being read. It is an appealing way to build a list because it connects to what the class is doing.
It also produces ten unrelated spellings. Whatever a child learns from mastering thermometer transfers to no other word, because nothing else is spelled like it. The list is learned, tested, and largely forgotten, and the next list starts from nothing.
What a patterned list does instead
Compare a list of light, night, sight, fright, bright, might, tight, flight. It looks narrower and it teaches far more, because the child is not learning eight words — they are learning that this particular sound is frequently written -ight.
The test of whether that worked is a word not on the list. A child who has understood the pattern will make a reasonable attempt at slight without having seen it, because they have a rule to apply. A child who memorised eight words has nothing to apply.
That generalisation is the entire point of spelling instruction. There are far too many words in English to learn one at a time, and the only way through is patterns that cover many words at once.
Patterns worth building lists around
Sound-to-spelling patterns, where one sound has a common written form: -ight, -tion, -ough, the ai and ay spellings of the same sound.
Morphological patterns, where a rule governs how words change: doubling the final consonant before -ing, dropping the silent e, changing y to i before adding -es.
Prefix and suffix families, where a meaningful chunk repeats: un-, re-, pre-, -ness, -ment, -ful. These carry meaning as well as spelling, so a list of them teaches vocabulary at the same time.
Contrast pairs, where two similar patterns are deliberately mixed so the child has to choose — words with -tion against words with -sion, for instance. These are harder and best used after each pattern is secure alone.
Keep recycling the words they actually get wrong
A small number of high-frequency words are misspelled by most children for years: because, friend, said, there, their, they're, which, would, people, beautiful.
These break the patterns, which is exactly why they need direct attention. They are also the words that turn up in nearly every piece of writing a child produces, so fixing one pays off on every page thereafter — a far better return than a rarer word learned once for a test.
It is worth carrying two or three of them into every list, regardless of the pattern that list is built on, and continuing to do so long after they appear to be learned.
Dictate in sentences
A word read aloud on its own leaves homophones unresolvable. There, their and they're are the same sound, and a child who writes the wrong one has not necessarily made a spelling mistake — they were not told which word was meant.
Reading each word inside a short sentence fixes the meaning and makes the test about the word children will actually need when writing. It is also the only way to test homophones at all, which matters because homophone confusion is one of the most persistent spelling problems there is.
Test mid-week, and have them correct their own
The standard cycle — list on Monday, test on Friday — reliably produces good Friday scores and poor retention, because it rewards cramming the night before. Adding a Wednesday test, unannounced and unrevised, shows what is actually being retained. The gap between the Wednesday and Friday scores is often the most informative thing you will learn all week.
Afterwards, the minute that matters is the one where the child writes the correct spelling beside their own attempt, two or three times. Marking done by an adult and handed back does much less, because the child never engages with where their version diverged from the right one. Leave room on the sheet for it.