THE KIWIABC BLOG
They look the same on the shelf, but they train opposite habits. The ten-second test, and why NZ schools switched.
📚Side by side on a shelf, a decodable book and a predictable book look much the same — thin, bright, ten pages, a cheerful animal. But they're built on opposite theories of how children read, and they train opposite habits. Here's how to tell them apart in ten seconds, and why NZ schools switched.
A predictable (or "repetitive") text runs on a repeating sentence frame with a picture cue: "I can see a cow. I can see a horse. I can see a pig." A new entrant can "read" it fluently on day one — which feels magical. The catch: they're not decoding horse; they're reciting the frame and reading the picture. The habit being practised is guessing from context, and it quietly falls apart around age seven when the pictures disappear and the words get long.
A decodable book controls its words to match what the child has been taught so far. If a child knows short vowels and sh, the book is built from words like ship, shed, fish — plus a handful of taught irregulars like the. Every word is one the child can genuinely work out. The habit being practised is look at the letters, decode the word — the habit that scales to any book for the rest of their life.
🔍 The ten-second shelf test
Open the middle page and ask: could my child read this sentence with the picture covered? If yes (given the sounds they've been taught), it's decodable. If they'd need the picture or the repeating pattern, it's predictable.
With the move to structured literacy, classrooms in Years 0–3 now teach with decodable series — most commonly the Ministry's Ready to Read Phonics Plus books, which follow the same four-phase sequence (Kākano → Tupu → Māhuri → Rākau) that KiwiABC uses. The decodable stage isn't forever: once a child has the full code (usually during Years 2–3), they graduate to ordinary "real" books — the decodables have done their job.
Early ones can be, honestly — there are only so many plots available to Sam, a mat and a rat. Three things help:
That last one is exactly what KiwiABC's sound switcher is for — teaching oa this week means there's a mystery for that, with decodable clues and a culprit to catch. The first cases in every phase are free.
Every KiwiABC mystery is a decodable reading activity — read the clues, crack the code, catch the culprit. The first ones in every phase are free.
Try a free mystery →