By Clay Shumate
Co-teaching models are the six ways two teachers can share one classroom: one teach one observe, one teach one assist, station teaching, parallel teaching, alternative teaching, and teaming. The first two are the most common and the cheapest to plan. The three that change what students actually experience — stations, parallel and teaming — cost real planning time.
Key Takeaways
- There are six co-teaching models, and they are not interchangeable. Georgia’s state guidance rates one teach one observe, one teach one assist and station teaching as low planning cost, parallel teaching as medium, and teaming and alternative teaching as high.
- The measured achievement effect is small. Across eleven years of Massachusetts data in grades 3–8, co-teaching raised reading scores for students with disabilities by 0.016 standard deviations and math by 0.026. Middle-grades math was the biggest single effect at 0.036. For students without disabilities, math gained 0.012 and reading showed nothing.
- The widely quoted number is roughly fifteen times larger, and both deserve to be on the table. A 2001 meta-analysis averaged about 0.40 standard deviations — but only six studies out of 89 met its inclusion criteria, and few compared co-taught students against a pull-out control group.
- One teach, one assist dominates, and that is the problem. In a synthesis of 32 qualitative studies covering 454 co-teachers, 25 of them described the special educator in an assistant-like or subordinate role, and differentiated instruction was rarely observed at all.
- Planning time is the binding constraint, not goodwill. One study inside that synthesis found co-teaching teams averaged 45.5 minutes of shared planning a week and said they needed close to three times that.
Two adults in one room is one of the most expensive instructional decisions a school makes. It is also one of the least examined. Schedules get built, names get paired, and then the two teachers are left to work out what the second adult is for. The default answer — one teaches, the other walks around — is the model that research finds most often and recommends least.
This guide sets out the six co-teaching models, what the evidence says about whether co-teaching works, and which model fits which lesson in grades 6–12. The structures and timings below are compiled from the sources listed at the end, so read them as recommendations rather than a record of any one classroom. Where the research population was elementary, it says so.
What Are the Six Co-Teaching Models?
The six co-teaching models are one teach one observe, one teach one assist, station teaching, parallel teaching, alternative teaching, and teaming. They differ in how students are grouped, which adult is delivering instruction, and how much shared planning each one requires before the lesson starts.
Co-teaching is two certified teachers sharing responsibility for instruction, assessment and management in the same classroom at the same time. Georgia’s state guidance names all six and rates each one for planning cost, which is the detail most lists leave out and the one that decides whether a model survives past October.

| Model | What happens | Planning cost | Best for | Main drawback |
|---|---|---|---|---|
| One teach, one observe | One teacher leads the whole group; the other watches named students and records what they do | Low | Finding out why a specific student stalls, before you change anything | Produces data, not instruction. Useless if nobody reads the notes |
| One teach, one assist | One teacher instructs; the other circulates and supports | Low | Covering a one-off lesson, or a first week while a pair is still learning each other | The second adult becomes an aide. This is the default and the weakest use of a licensed teacher |
| Station teaching | Small groups rotate through two or three stations, each teacher owning one | Low | Practice, review, labs, document work — anything with discrete tasks | Noise and timing. One slow station derails the rotation |
| Parallel teaching | The class splits in half; each teacher teaches the same content to one group | Medium | Discussion, questioning, anything where halving the group doubles airtime | Both halves must arrive at the same place. Requires genuinely shared planning |
| Alternative teaching | One teacher re-teaches or extends with a small group while the other works with the rest | High | Students who missed a prerequisite, and students who already have it | Visible grouping. If the same students always get pulled, you have built a tracked class inside a period |
| Teaming | Both teachers present, question and model to the whole group, trading roles | High | Modeling disagreement, two-method explanations, debate and seminar framing | The most planning of any model, and it fails flat if the pair has not rehearsed |
Notice what the planning column does to the list. The two models that need almost no preparation are the two that leave one teacher doing nothing a trained paraprofessional could not do. The models that justify the second salary are the expensive ones. That tension is the whole subject.
Does Co-Teaching Actually Improve Achievement?
Modestly, and by less than the usual claim. The largest study to date, covering eleven years of Massachusetts testing data in grades 3–8, found co-teaching raised reading scores for students with disabilities by 0.016 standard deviations and math by 0.026. Those are real, statistically significant and small.
Nathan Jones and Marcus Winters compared the same student’s scores in co-taught and single-teacher classrooms over time, using student and school fixed effects on state administrative data from 2007–08 through 2017–18. The math sample alone runs to roughly 129,700 observations for students with disabilities and 285,700 for students without. Their findings, in standard deviations:
- Students with disabilities, reading: +0.016, significant, with no difference between elementary and middle grades.
- Students with disabilities, math: +0.026 overall — 0.036 in middle grades against 0.014 in elementary, and that difference is itself significant.
- Students without disabilities, math: +0.012, significant.
- Students without disabilities, reading: no significant effect.
The authors are blunt about the comparison that matters. Their estimate for students with disabilities is far below the roughly 0.40 standard deviations averaged by Murawski and Swanson’s 2001 meta-analysis, and they place their own result around the 30th to 40th percentile of randomized-trial effect sizes — “small” by the standard taxonomy. If you have seen co-teaching sold on the 0.40 figure, this is the number that followed it.
Why the older number is so much bigger
The 2001 meta-analysis is not fraudulent; it is thin. A Virginia Commonwealth University summary of it, which is the version I was able to read in full, records that 89 studies were found, 52 were excluded for lacking substantial data, and only six met every inclusion condition, including a co-teaching treatment lasting more than two weeks. Those six produced a large reported gain in reading and language arts, a moderate gain in math, and moderate reductions in absences and referrals. The same summary records the authors’ own caveat: few of the studies included a control group of students with disabilities in self-contained or pull-out settings, which is the comparison the whole question rests on.
Solis, Vaughn, Swanson and McCulley’s 2012 review of six syntheses is often cited alongside it as independent confirmation. It is not. For student outcomes it draws on the same studies. Two citations, one evidence base.
So the honest position is this. Co-teaching, as actually implemented across an entire state, produces small positive effects for students with disabilities and a small math effect for everyone else. The larger figures come from a handful of studies of deliberately good practice. Jones and Winters say so themselves: their data cannot see what teachers did in those rooms, so their estimate is the average of statewide implementation, not of co-teaching done well.
What a small effect does and does not justify
A district reading those numbers will notice immediately that co-teaching puts two salaries in one room for a gain the authors themselves call small. That is a fair observation and it leads to the wrong conclusion, for a reason the achievement data cannot show. For most schools co-teaching is not an instructional experiment they chose; it is the structure through which students with disabilities receive services in a general education setting rather than a separate one. Dropping it does not return the money. It changes where a student sits all day.
Which makes the implementation finding the actionable one rather than the effect size. Jones and Winters are measuring average practice, and average practice — per the qualitative research in the next section — is one adult teaching and one adult circulating. The arithmetic a district should run is not “is 0.026 worth two salaries,” it is “we are already paying for this; what would it take to move it off the cheapest model.” The research answer to the second question is specific and unglamorous: shared planning time with an agenda, training the pair attends together, and pairing by content rather than by schedule.
Why Is “One Teach, One Assist” So Common, and Why Is That a Problem?
Because it needs no shared planning and no agreement about who is in charge. The cost is that the second teacher stops teaching. In a synthesis of 32 qualitative studies, 25 described the special educator in an assistant-like or subordinate role, and whole-class instruction largely persisted.
Scruggs, Mastropieri and McDuffie’s metasynthesis of 32 qualitative reports pulled together the views of 454 co-teachers, 42 administrators, 142 students, 26 parents and five support staff. Fifteen of the studies were elementary or earlier, fourteen were junior high, middle or high school, and three covered both — so unlike much of this literature, roughly half of it is about rooms like the ones this site is written for.
Their findings are uncomfortable reading, and they have not been superseded:
- One teach, one assist was by far the most common model. Parallel, station and team teaching appeared much less often.
- In 25 investigations the special educator’s role was described as subordinate, sometimes because of weaker content knowledge in the subject. One study found the special educator “seldom took (or was permitted to take) the lead in instruction.”
- Differentiation was rarely observed. In one study teachers used whole-class activities 100 percent of the time. Another reported “little differentiation of instruction to address individual needs.”
- Strategy instruction, mnemonics and peer mediation — the practices the literature recommends most — were seldom observed.
The authors’ conclusion is the sentence worth taking to a faculty meeting: the ideal of two equal partners has “largely not been met.” Students with disabilities were receiving good general education instruction with assistance, but possibly not special education. They borrow Hargreaves’ phrase and call much of the practice “contrived collaboration” — partnership produced by a schedule rather than by two people choosing it.
One caveat in their favour, which they raise themselves: ten of the 32 studies deliberately examined outstanding examples of co-teaching. If anything, the picture is more flattering than typical practice.
A smaller 2017 case study makes the same point at close range. Brendle, Lock and Piazza observed two co-teaching pairs and found that neither pair could name the model they were using. Co-planning covered lesson modification and rarely touched how instruction would be delivered or assessed. Only one of the four teachers had ever attended co-teaching training, and none of them had trained together. That study was in a single elementary school, with fourth- and fifth-grade pairs, so treat it as illustrative rather than as evidence about secondary rooms.
Which Co-Teaching Model Should You Use, and When?
Match the model to the lesson’s job. Use stations for practice and discrete tasks, parallel teaching when you need discussion airtime, alternative teaching when a group is missing a prerequisite, and teaming when the point of the lesson is to show two ways of thinking. Keep one teach, one assist for the weeks you have not planned together.

The useful question is not “which model is best.” It is “what does this lesson need that one adult cannot do?” Three answers come up repeatedly in grades 6–12.
The lesson needs more student talk
Thirty students and one teacher means most of them say nothing. Parallel teaching halves the group, which roughly doubles every student’s airtime. It is the model that pairs best with a seminar or any structured discussion format, and the one that most obviously justifies the second teacher to a student watching the room.
Some students are missing a prerequisite
Alternative teaching exists for this and is the most easily abused model on the list. The rule that keeps it honest is that the pulled group changes. If the same six names go to the back table every week, the period now contains a tracked class, and the students know it before you do. Pairing it with clear learning targets makes the grouping legible: students can see which target they are working on and when they are done with it.
It also matters how the grouping is named out loud. “Come with me” aimed at the same table every Tuesday is a label. “Anyone who wants another pass at the second target, come over” is an invitation, and it lets a student who has it wrong but would never say so take the help without being assigned to it. Grades 6–12 students will refuse useful support rather than be seen receiving it, which is a predictable behaviour and not a character flaw. Build the model so accepting help is a choice they make.
The content has two defensible approaches
Teaming is where two teachers earn their keep. Two adults solving the same problem two ways, or openly disagreeing about an interpretation and then reasoning it out, is a lesson a single teacher cannot deliver. It is also the highest planning cost on the Georgia list, and it does not survive being improvised.
What all three have in common is that they need agreement before the bell, not during the lesson. That is also why differentiation that does not need five lesson plans matters more in a co-taught room than a solo one: the cheapest differentiation moves are the ones two teachers can run without a second plan.
How Much Planning Time Does Co-Teaching Really Need?
More than schools give it. Inside the 32-study synthesis, one investigation found co-teaching teams averaged 45.5 minutes of shared planning a week and reported needing close to three times that. Another found 40 minutes a week still felt insufficient.
Planning time was the most frequently raised need in the synthesis, appearing in nearly every study. That is not a complaint about workload. It is a structural fact about the models: station, parallel, alternative and teaming all require two people to agree in advance on who does what, with which students, to what standard. Without that agreement the pair defaults to one teach, one assist, because it is the only model that works with no conversation.

The 2017 case study shows how time alone does not fix it. Administrators there scheduled one day every nine weeks plus a half day every two weeks for collaboration, and the teachers valued it — but they received no guidance on what co-planning should cover, so the time went on modifying worksheets rather than on deciding how instruction would be delivered. Protected time with no agenda becomes modification time.
What if your co-teacher will not plan with you?
This is the question the model diagrams never answer, and teacher compatibility is named as a concern throughout the qualitative research. If the shared planning is not happening, the realistic move is not to fix the relationship first. It is to pick the one model that works with almost no negotiation and run it well.
Station teaching is that model. You can hand someone a single station with a clear task, a time limit and a defined output, and it functions even if the two of you never agree on anything else. It is low planning cost by design, and unlike one teach one assist it puts the second teacher in front of students doing instruction. Start there, keep a written record of what you proposed, and take the pattern to an administrator if it does not move — a pair that cannot plan is a scheduling problem, not a personality one, and it is fixable at the level that built the schedule.
If you are the one asking an administrator for something, ask for the two things the research actually points at: shared planning time with a named agenda, and training the pair attends together. Professional development that only one of the two attends cannot build a shared model, which is exactly what the case study found.
What Does Co-Teaching Have to Do With Treating Students Like Young Adults?
Students read the hierarchy in the room long before they read the lesson plan. When one of two licensed teachers spends every period handing out papers, students learn which adult counts. That lesson undercuts everything a co-taught class is supposed to signal about shared responsibility.
This is where I will put my own view plainly, because the research does not reach it. My position on respect in a classroom is that it is mostly mechanical: you do what you said you would do, every time, and students decide you are credible. A co-taught room makes that harder for two people at once, because now two adults have to say the same thing about deadlines, consequences and what counts as finished. If they do not, students will find the gap within a week and work it.
The other half of it is about teachers, and I have said this before on this site. Keeping your ears open and your mouth closed sometimes pays off; keeping your ears open and asking questions really pays off. In my first year I picked up a review format from another teacher on my hall because he noticed I was short on them and offered. That is what co-teaching is supposed to be an institutional version of — and a pair where one person is permanently the assistant has lost the part that made the informal version work.
The practical test I would apply, as a teacher rather than as a reader of studies: could a student in that room name what the second teacher is for? If the answer is “she helps,” the model is one teach, one assist whatever the schedule calls it.
How Do You Start Co-Teaching Well in Grades 6–12?
Start by agreeing on the non-instructional decisions, then add one new model at a time. The research points at three failure points — no shared planning agenda, no joint training, and no named model — so the first steps are the ones that close those.
- Name the model before the lesson, out loud. “Tuesday is stations; you take the document group.” The 2017 case study found pairs who could not name what they were doing, and a model nobody names cannot be improved.
- Agree on the boring things first. Who answers a question about a grade. Who calls a parent. Whose consequence applies when both of you saw it. Disagreement here is what students exploit, and it is cheaper to settle in August. A single written routine for late work, missing work and consequences gives both of you the same script to read from.
- Take one low-planning model and one high-planning model. Stations cost little and immediately stop one adult from standing still. Pick one of parallel or teaming as the model you will actually build, and leave the others alone until that one is reliable.
- Put a standing agenda on the shared planning time. Not “what are we doing” but: which model, who leads, how we will know students got it, and who is being re-taught, and who grades it. Deciding the check in advance is what turns two adults into two sources of information instead of one teacher and one observer. The 2017 case study found co-planning almost never reached assessment, which is how one teacher ends up owning the gradebook and the other ends up owning nothing.
- Tell the students what the second teacher is for. Say it in the first week and say it again when the model changes: both of us teach, both of us grade, either of us can answer you. Students work out the hierarchy on their own if nobody states it, and the version they work out is usually the one you did not want.
- Rotate who leads. If one of you has never opened a lesson by November, that is the subordinate-role finding happening in your room. Swap on content where the other person is strong.
- Audit the pulled group once a month. List the names who have gone to alternative teaching. If the list barely changes, change the grouping or stop using the model.
Where Co-Teaching Goes Wrong
- The second teacher is treated as capacity, not expertise. This is the subordinate-role finding, and it is the single most replicated result in the qualitative literature.
- Pairing is done by schedule rather than by content. A special educator asked to co-teach four different subjects cannot hold four content loads, which is one reason the literature keeps finding weaker content knowledge as the cause of the subordinate role. The three loads that drive special education burnout are the same loads that make this worse.
- Nobody reads the observation notes. One teach, one observe is the only model whose entire output is data. If it is not read and acted on, it is a teacher watching a class.
- Alternative teaching hardens into tracking. Same names, same table, every week.
- The pair is split up after one year. Teachers in the 2017 case study asked specifically to stay paired. Rebuilding a working pair costs a year of the thing that was working.
What to Do Next
Pick one lesson next week that needs something one adult cannot do, and run stations or parallel teaching for it on purpose. Name the model to your co-teacher and to the students. Then look at the pulled-group list and at who opened the last five lessons. Those two lists will tell you more about your co-teaching than any model diagram.
If you are building the structures a second adult plugs into, the next useful piece is the procedures that carry the most weight in grades 6–12. They are easier to run with two people and they collapse faster when the two people disagree about them.
Sources
- Jones, N., & Winters, M. A. (2022). Are two teachers better than one? The effect of co-teaching on students with and without disabilities (Working Paper 2020–1, updated January 2022). Boston University Wheelock Policy Center. Massachusetts administrative data, 2007–08 to 2017–18, grades 3–8. Read in full.
- Scruggs, T. E., Mastropieri, M. A., & McDuffie, K. A. (2007). Co-teaching in inclusive classrooms: A metasynthesis of qualitative research. Exceptional Children, 73(4), 392–416. 32 qualitative reports; 14 of them junior high, middle or high school. Read in full.
- Georgia Department of Education. Co-teaching model one pager. Source for the six model names and the planning-cost ratings. The document states no advantages or cautions per model; those columns in the table above are compiled for this guide.
- Brendle, J., Lock, R., & Piazza, K. (2017). A study of co-teaching: Identifying effective implementation strategies. International Journal of Special Education, 32(3), 538–550. Four teachers, two pairs, one elementary school. Read in full.
- Virginia Commonwealth University RRTC. Co-teaching efficacy: What does the research say? Used as the readable summary of Murawski & Swanson (2001), Remedial and Special Education, 22(5), and of Solis, Vaughn, Swanson & McCulley (2012). The primary meta-analysis was not reachable; this summary of it was, and the six-of-89 inclusion figures and the verbal effect labels come from the summary, not from the paper itself.
What are the six co-teaching models?
One teach one observe, one teach one assist, station teaching, parallel teaching, alternative teaching, and teaming. Georgia’s state guidance rates the first three as low planning cost, parallel teaching as medium, and alternative teaching and teaming as high. They differ in how students are grouped and which adult is delivering instruction.
Does co-teaching improve test scores?
By a small amount. The largest study, covering eleven years of Massachusetts data in grades 3 through 8, found gains of 0.016 standard deviations in reading and 0.026 in math for students with disabilities, and 0.012 in math for students without. Reading showed no significant effect for students without disabilities.
Why is the 0.40 effect size for co-teaching so much larger?
It comes from a 2001 meta-analysis in which only six studies out of 89 found met every inclusion condition, and few compared co-taught students against a pull-out control group. The 0.40 figure describes a handful of studies of deliberately good practice; the 0.016 to 0.036 range describes an entire state’s typical implementation.
What is the most common co-teaching model?
One teach, one assist, by a wide margin. A synthesis of 32 qualitative studies found it dominant, with parallel, station and team teaching appearing much less often. It requires no shared planning, which is why it wins by default, and it leaves one licensed teacher doing work a paraprofessional could do.
How much shared planning time do co-teachers need?
More than they get. One study inside the 32-study synthesis found teams averaging 45.5 minutes a week and saying they needed nearly three times that. A separate case study found that protected time without a named agenda gets spent modifying worksheets instead of deciding how instruction will be delivered.
Is co-teaching only for students with disabilities?
No, though that is its usual purpose. The Massachusetts study found a small significant math gain for students without disabilities as well, and the qualitative research reports social benefits for them more often than academic ones. Any two teachers sharing a room are using one of the six models whether they name it or not.
My child is in a co-taught class. What should I ask the school?
Ask who the two teachers are and what each one is responsible for, whether your child is being pulled into a small group and how often, and who to contact about grades. A co-taught class is not a lower-level class. If the answer is that one teacher helps the other, the school is using the weakest of the six models and it is fair to ask why.
Which co-teaching model should a new pair start with?
Station teaching. It costs little to plan, it immediately stops one adult from standing still, and it works with content you already have. Then choose one high-planning model, parallel teaching or teaming, and build that one properly rather than sampling all six.


















