If you wanted your child to learn to play piano, you would not hand them the sheet music for Etudes-tableaux, Op. 39: No. 1 in C Minor, Allegro agitato and tell them, “Here, play this.” You would start by going to toddler and preschool music groups where they would clap to the beat of simple songs and twirl with scarves to happy music. As they got older, you’d show them how to place their fingers on a piano’s keyboard. You would give them simple songs with only two or three notes. Then you’d build up to Chopsticks and Twinkle, Twinkle, Little Star. With time and practice, you would have them play more and more complicated songs. From the very beginning you would immerse them in music by playing music in the car or while cleaning the house. You might have picnics at Music Under the Stars by the local pops orchestra or city symphony. You might even start singing together while walking down the frozen foods aisle at the grocery store.
There are some kids who could sit at a piano and play Fur Elise without much difficulty, but those children are the exception. Most kids just don’t learn that way.
Reading is the same. Some kids will do well if you simply read to them. It seems as if by osmosis they learn to read. However, most kids are not like that. They learn best when they start by playing games to learn about words, rhymes, syllables, and letter sounds. Then they are taught a few phonics rules and helped to sound out words and sentences that exclusively follow those rules. As they learn more phonics rules, they are ready for books with those rules.
Decodable books are books that follow the rules. They can be sounded out by anyone who has been taught the rules in that book. Systematic, sequential decodable books are a series of books that add a few more rules in each subsequent book, or group of books, of that series.
Of course, kids need to be immersed in books from the time they are infants. They need parents that read language-rich books with interesting characters that take them on amazing adventures. Children need library story time and books filled with pictures where they can imagine the stories even before they can read the words. Many kids love audio books that have paper books where they can see the words that are read to them.
In time, children will outgrow decodable books. They will have gained the skills to read books that do not limit the phonics. They will simply read what is in front of them. And that is the goal of decodable books. They are a tool for learning to read that will eventually be a fond memory.