The Ladybird Key Words Reading Scheme uses the most frequently met words in the English language-Key Words-as a starting point for learning to read successfully and confidently. With this essential vocabulary established, children are able to tackle more complicated reading.

- Once introduced, words are repeated in a variety of ways to
   help word recognition.
- New vocabulary is introduced alongside established vocabulary
- Each book had a separate list of the new words introduced
   which can be used as a check list or to practise words out of   
   context.

- 12 Key Words make up one quarter of those we read and write.
- 100 Key Words make up half of those we read and write.
- About 300 Key Words account for three quarters of those we
   read and write

The 'a' series gradually introduces and repeats new words.