The Orton-Gillingham approach is a method of teaching reading and spelling that uses sight, hearing, touch, and movement simultaneously to help students learn how written language works. It was originally designed for people with dyslexia and other word-level reading disabilities, and it remains one of the most widely used interventions for struggling readers. Rather than asking students to memorize whole words or guess from context, it breaks English down into its smallest sound-letter relationships and teaches them in a carefully ordered sequence, from simple to complex.
How Multisensory Instruction Works
The defining feature of Orton-Gillingham is its multisensory design. During a typical lesson, a student doesn’t just look at a letter and hear its sound. They might trace the letter in sand while saying the sound aloud, tap out syllables on a table, or use letter tiles they can physically move around to build words. The idea is to activate multiple learning pathways at once: visual, auditory, and kinesthetic (touch and movement). This simultaneous engagement is what distinguishes OG from conventional reading programs that rely primarily on seeing and hearing.
For students with dyslexia, which is neurobiological in origin and affects the brain’s ability to connect written symbols with sounds, this layered input can make abstract concepts more concrete. A child who struggles to remember that the letter “b” makes a certain sound may retain it more easily if they also feel the shape of the letter under their fingertips while producing the sound with their mouth. Each sensory channel reinforces the others.
The Six Core Principles
Orton-Gillingham is built around six descriptors that shape every lesson:
- Direct and explicit: Nothing is left for the student to infer. Lessons are designed so students understand what they’re learning, why it matters, and how to apply it.
- Structured and sequential: Content follows a logical order, moving from simple, well-learned material to increasingly complex patterns. A student masters short vowel sounds before tackling vowel teams, for example.
- Diagnostic: The instructor continuously monitors a student’s verbal, nonverbal, and written responses to identify where they’re struggling and where they’re progressing.
- Prescriptive: Each lesson is tailored based on what the diagnostic monitoring reveals. If a student hasn’t mastered a concept, the next lesson focuses on that gap rather than pushing ahead.
- Multisensory: Every lesson engages seeing, hearing, feeling, and movement together.
- Cumulative: New material builds on what’s already been taught. Students regularly review earlier concepts so skills stay sharp as complexity increases.
This combination means two students receiving OG instruction might follow different paths through the same material, depending on what each one needs. It’s an approach, not a rigid curriculum, which is why it looks different in different classrooms and tutoring sessions.
What a Typical Lesson Sequence Covers
OG instruction follows a scope and sequence that starts with the most basic sound-letter relationships and gradually layers in more complex patterns. A common progression moves through these categories:
- Individual letter names and their most common sounds
- Short vowel sounds (the “a” in “cat,” the “i” in “sit”)
- Basic consonant sounds
- Consonant digraphs, where two letters make one sound (“sh,” “ch,” “th”)
- Consonant blends, where two or three consonants appear together but each keeps its sound (“bl,” “str”)
- R-controlled vowels (the “ar” in “car,” the “or” in “fork”)
- Vowel teams, where two vowels together create a single sound (“ea,” “oa,” “ai”)
At each stage, students practice blending individual sounds into words, breaking words apart into their component sounds, reading connected text that uses the patterns they’ve learned, and spelling words that follow those same patterns. The instructor doesn’t move to the next level until the student has demonstrated mastery of the current one. This pace can feel slow, but it prevents the gaps in foundational knowledge that often cause reading difficulties to compound over time.
Who Benefits Most
Orton-Gillingham was developed specifically for students with dyslexia, which the International Dyslexia Association defines as a specific learning disability characterized by difficulties with accurate or fluent word recognition, poor spelling, and poor decoding. Dyslexia is neurobiological, meaning it reflects differences in how the brain processes language rather than a lack of intelligence or effort.
Beyond diagnosed dyslexia, OG is commonly used for students “at risk” for word-level reading disabilities. This includes young children who are falling behind their peers in early reading skills, older students who never fully mastered phonics, and anyone who struggles to connect the sounds of spoken English with the letters and letter patterns that represent them on the page. Some schools and tutoring centers also use OG-based methods with English language learners, since the structured, explicit approach to English spelling patterns can benefit anyone navigating the language’s irregular rules.
How OG Connects to the Science of Reading
The Orton-Gillingham approach predates the modern “Science of Reading” movement by decades, but the two share deep roots. The Science of Reading is a broad body of research showing that effective reading instruction must explicitly teach phonemic awareness (the ability to hear and manipulate individual sounds in words) and phonics (the relationship between those sounds and written letters). OG does both of these things systematically.
Many of the structured literacy programs now being adopted by school districts across the country are described as “OG-based” or “OG-informed,” meaning they draw on the same principles of explicit, sequential, multisensory phonics instruction. Programs like Wilson Reading System, Barton Reading and Spelling, and several others trace their design philosophy back to Orton-Gillingham. The approach itself isn’t a branded product; it’s a framework that these programs build on.
Where OG Instruction Happens
Orton-Gillingham instruction is delivered in several settings. Private tutors trained in the approach work one-on-one with students, which allows for the most individualized pacing. Some schools employ OG-trained specialists who pull small groups of struggling readers for targeted intervention. A growing number of classroom teachers are incorporating OG principles into their general reading instruction, though the approach is most intensive and effective when delivered individually or in very small groups.
Sessions typically run 40 to 60 minutes and happen multiple times per week. How long a student needs OG instruction depends entirely on where they started and how quickly they progress. Some children work with an OG tutor for a year; others continue for several years. Because the approach is diagnostic and prescriptive, the instructor adjusts the pace continuously rather than following a fixed timeline.
Teacher Training and Certification
Not every teacher who claims to use Orton-Gillingham has undergone formal training. Two major organizations accredit OG training programs: the Academy of Orton-Gillingham Practitioners and Educators (AOGPE) and the International Multisensory Structured Language Education Council (IMSLEC).
IMSLEC-accredited programs, for example, require a bachelor’s degree, at least 45 hours of coursework, a 60-hour practicum involving individual tutoring sessions, a minimum of five direct observations by a qualified trainer, and 600 clock hours of supervised teaching experience. The entire process takes at least nine months. AOGPE has its own tiered certification levels with similar rigor. If you’re seeking an OG tutor for your child, asking about their specific certification and which organization accredited their training is a practical way to gauge their qualifications.
The investment in training reflects the complexity of what OG instructors do. They aren’t following a script. They’re making real-time diagnostic decisions about what a student understands, where confusion is creeping in, and which multisensory technique will help a particular concept click. That level of responsiveness requires deep knowledge of English language structure and extensive supervised practice.