What Is the Montessori Key Sound Approach? (Muriel Dwyer's Method)

The Montessori key sound approach, developed by AMI teacher trainer Muriel Dwyer, gives every letter of the alphabet one reliable "key" sound. It then adds a set of common digraphs (like sh and ch) to cover the other sounds of English. With these key sounds, students can spell any word phonetically, long before they know every spelling rule. They are the first letter sounds we teach.

Why start with key sounds?

English is only partially phonetic. Some letters are very predictable (for example, 'm' almost always says mmm). Others are not (think of the 'e' in egg and the 'e' in Pete). We don't want to overwhelm beginners with all of that unpredictability at once. Instead, we teach the reliable parts of English first to build confidence and get students started. Then we slowly add in spelling variations.

Where did the key sound approach come from?

Muriel Dwyer figured this out decades ago, and you can read all about it in her book. She was teaching the Montessori approach to language in both English and Swahili. Dr. Montessori's original Italian comes close to one letter, one sound. English and Swahili do not. So Dwyer had to find a logical way to handle all the sounds that single letters can't cover.

The result was the key sound approach. (The green sandpaper letters you see in Montessori classrooms are a direct result of her work.) The chart below gives an example of the key sound for each letter of the alphabet (yes, some are redundant, like c and k) and the 17 additional digraphs students need.

How do you teach a key sound?

• Show the student the letter 'a.'
• Say, "This says aaa, like apple, map, Africa."
• Invite the student to trace the letter while repeating its sound and saying words that feature the sound.
• Repeat with two or three other key sounds (letters or digraphs).

Why teach digraphs from the start?

We don't limit this to the 26 letters of the alphabet. If we did, students would be missing many of the sounds of English. Think about 'sh.' How would a student who only learned the 26 letters spell ship? That's why we teach digraphs too.

And there's no real reason to hold digraphs back for later, especially with young children. Their brains are just learning to recognize letters and connect them to sounds. They are in a sensitive period that makes this easier. So why limit them to only part of what they need to succeed with English?

What about letter names?

The key sound approach focuses on letter sounds, but that doesn't mean we leave out letter names. We can simply say, "This is the letter 'a.' It says aaa, like apple." It's an effortless way to introduce both the name and the sound. Both are important for literacy.

From key sounds to writing

The beauty of this approach is that once students learn the key sounds with sandpaper letters, letter-sound charts, and/or 3-part letter sound cards, they are immediately ready to start writing words phonetically with the movable alphabet. Students spell words before they easily read them. This is the encoding-before-decoding sequence at the heart of the Montessori Science of Reading.

Yes, students will misspell some words at first (writing 'kat' instead of 'cat,' for example). You might worry that those misspellings will get locked in through repetition. But that isn't what we see. Once students start reading, they begin to discover how words are actually spelled. They start to question their own spellings. That is the moment to branch out into the less predictable parts of English. Muriel Dwyer's phonogram spelling folders are a logical place to begin.

The hidden gift of the key sound approach

In sum, the key sound approach lets students work with all of the sounds of English right away, so they can begin to express themselves. The key sounds prepare them to put their thoughts and ideas into writing. They learn that they have something to say, that they can write it, and that their voice matters. This is the great hidden gift of Dwyer's key sound approach. It's not just about learning literacy skills. It's about helping each human reach their full potential, and the key sound approach makes that an easier road to follow.

Frequently asked questions