5 Evidence-Based Strategies to Boost MLU (That You Can Use Tomorrow!)

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Why MLU Goals Matter

Mean Length of Utterance (MLU) is one of the most reliable and widely used measures for tracking expressive language development (Brown, 1973; Miller & Chapman, 1981). It helps SLPs identify where a student is, monitor progress, and plan therapy that supports steady, functional growth.

In this post (and the SLP Now Podcast episode), we’ll walk through five evidence-based strategies for boosting MLU in a way that’s fun, functional, and easy to monitor—plus an example from a Little Blue Truck therapy plan.

1️⃣ Identify Targets Using a Language Sample

Before starting intervention, collect a language sample to get an authentic picture of your student’s communication.

Language sampling provides:
– An accurate baseline for MLU (Brown, 1973; Miller & Chapman, 1981)
– Insight into which structures and parts of speech are missing
– Data for ongoing progress monitoring

Many SLPs find language sampling intimidating, but it doesn’t have to be!

💡 Try This: Use the Language Sample Freebie to automatically calculate MLU and extract metrics for reports. The spreadsheet even helps you organize utterances and visualize growth over time.

2️⃣ Embed Targets in Play, Books, Songs, and Routines

Once you know your student’s targets, embed them in natural contexts, like play, shared book reading, songs, and daily routines. Research consistently supports that language learning is strongest when embedded in meaningful, interactive experiences (Fey, 1986; Justice & Ezell, 2002).

Why it works:
– Encourages spontaneous use of new language
– Supports generalization across settings
– Keeps therapy fun and functional

Try this:
– Reenact story scenes (“Truck stuck!” “Push truck!”)
– Sing songs like The Wheels on the Bus
– Incorporate targets into daily routines (“Open door”)

✨ Explore SLP Now’s Play-Based Units for ready-made activities designed to build MLU through storybooks and play.

3️⃣ Model Just Above the Child’s Level

Modeling slightly longer utterances (about one morpheme above a child’s current level) is the core of MLU intervention.

This approach, supported by decades of research, helps children expand expressive language naturally (Brown, 1973; Fey, 1986; Camarata, Nelson, & Camarata, 1994).

Here are some potential strategies:

Expansions: Add grammatical elements while maintaining the child’s meaning.
Child: “Dog jump.” → SLP: “The dog is jumping!”

Extensions: Add related, new information.
Child: “The dog is jumping.” → SLP: “The brown dog is jumping!”

Recasts: Reformulate the child’s utterance using correct syntax.
Child: “Him run.” → SLP: “He is running!”

Focused Stimulation: Model the target without requiring imitation.

📏 The Rule of Thumb: Model just one step above what the student currently produces.

4️⃣ Use Sentence Frames and Visual Supports

For students who benefit from more structure, sentence frames and visuals can make language more accessible and concrete.

The SLP Now Sentence Pack includes:
– Movable icons for core parts of speech
– Sentence strips organized by MLU level
– Visual scaffolds for building utterances

Example:

Child: “Truck.”
SLP: (adds icon) “Truck stuck!”
Next: “Truck stuck in mud.”

Visual modeling helps students connect words with meaning, supports working memory, and facilitates sentence expansion—especially for early language learners or students with ASD (Kaiser & Roberts, 2013).

5️⃣ Use Contingent Responses and Time Delay

Last but not least: pause and wait.

Time delay and contingent responding encourage children to initiate and elaborate on their own utterances (Kaiser & Roberts, 2013).

How to implement:
– Utilize expectant pauses in play.
– Give processing time before asking another question.
– Use contingent comments (“You see the truck!”) to maintain interaction.

This small shift gives students processing space and often leads to longer, more complex utterances.

🛻 Therapy Plan in Action: Little Blue Truck

Here’s how all five strategies can fit into a single literacy-based therapy plan using Little Blue Truck (Schertle, 2008):

Before diving into the unit, we want to make sure we know where the student is at. Review the student’s language sample to determine what the “+1 Approach” might look like.

We can use expansions, extensions, recasts, and/or focused stimulation throughout all of the unit activities.

If a student needs additional support, we can use the Sentence Pack visuals and sentence frames to scaffold responses.

And we don’t wait to forget about wait time!

Here are a few quick examples of what the unit might include:
– Pre-Story Knowledge Activation: Take a virtual farm field trip.
– Shared Reading: Read the story.
– Comprehension: Ask WH-questions.
– Focused Skill Practice: Reenact the story using toys. (This is a fun context to target MLU, but also support early narrative skills!)
– Parallel Story: Help students create their own version of the story.

This aligns beautifully with Dr. Ukrainetz’s (2015) Literacy-Based Therapy Framework, which emphasizes meaningful language practice across reading, listening, and play.

✨ Final Takeaways

To help students grow their MLU naturally and confidently:
1️⃣ Start with a language sample to identify a baseline.
2️⃣ Embed targets in meaningful, play-based contexts.
3️⃣ Model one level above using expansions, extensions, and recasts.
4️⃣ Support with visuals and sentence frames.
5️⃣ Pause, wait, and respond contingently.

Each strategy builds on the next, supporting both language growth and engagement.

🔗 Resources Mentioned

Language Sample Freebie

Sentence Pack

Play-Based Therapy Plans

🧠 References

Brown, R. (1973). A First Language: The Early Stages. Harvard University Press.

Camarata, S. M., Nelson, K. E., & Camarata, M. N. (1994). Comparison of conversational‐recasting and imitative procedures for training grammatical structures in children with specific language impairment. Journal of Speech and Hearing Research, 37(6), 1414–1423.

Fey, M. E. (1986). Language intervention with young children. Allyn & Bacon.

Justice, L. M., & Ezell, H. K. (2002). Use of storybook reading to increase print awareness in at-risk children. American Journal of Speech-Language Pathology, 11(1), 17–29.

Kaiser, A. P., & Roberts, M. Y. (2013). Parent-implemented enhanced milieu teaching with preschool children with intellectual disabilities. Journal of Speech, Language, and Hearing Research, 56(1), 295–309.

Miller, J. F., & Chapman, R. S. (1981). The relation between age and mean length of utterance in morphemes. Journal of Speech and Hearing Research, 24(2), 154–161.

Schertle, A. (2008). Little Blue Truck. Houghton Mifflin Harcourt.

Ukrainetz, T. A. (2015). School-age language intervention: Evidence-based practices. Pro-Ed.

Transcript

Today we're going to chat about five evidence based strategies that we can use to boost students' mean length of utterance or MLU, in a way that's fun, functional, and easy to keep track of. I'm really excited that we'll be sharing some strategies that you can use in your very next session.

And then we will tie it all together, and show you what it would actually look like in context when you're applying these strategies. Our first strategy is to identify the baseline, using a language sample. Language samples can be a really helpful way to calculate the student's current MLU, and also see what types of utterances they're using and tracking that progress over time.

Regular language sampling helps us ensure that we're modeling at the right level. I love language samples, but a lot of times when I mention them to SLPs, I get a little bit of an eye roll, because they feel really time consuming and difficult.

I put together a, spreadsheet, maybe a decade old at this point, but it still works really well. it helps you calculate. So you just use it to type in your transcript, and then you separate it out by utterances, and then it automatically calculates the MLU and it helps you grab some other metrics so you can write a really fancy report based on the data or include it in your evaluation area or progress monitoring. It makes it really easy to grab the data that we need,for easy progress monitoring. I'll add the link to the language sample sheet that I made in the show notes. It includes a video and walks you through how to set it up.

That is a really helpful starting point, because we'll use this data as we go through. Our second strategy is to make sure that we're embedding targets in meaningful contexts, like, play, books, songs, routines.

And I'll share some specific strategies, of what we actually do in those functional contexts, but if we are embedding our strategies in those types of activities, we are thinking about generalization from the start and setting our students up for success and making sure that the targets are very meaningful.So that brings us to strategy number three. Different research articles will share different strategies, but there's a lot of overlap between the strategies and, I just wanna share the names of the strategies and what they are, and you'll see that there's some overlap.

I'll wrap up with a general takeaway of what we can do with these strategies. Expansions are where we add grammar while keeping the child's meaning. If the child says, "dog jump," you can say "the dog jumped," or "the dog is jumping."

An extension is adding new information. If the child says "the dog is jumping," we can say "the brown dog is jumping."We can do an extension where we add new information, but that's still related.

And then focused stimulation is when we're providing models and recasts without requiring imitation. It's just strategically using, those strategies. a recast is when we restate the child's utterance, but maybe do a correction, which is really similar to an expansion.

There's also research talking about modeling one level above the child's MLU, which expansions and extensions kind of naturally do. If the student says "dog run," and then if we suddenly go, "the excited dog is running quickly."

We're expanding and adding the grammar and we're adding multiple new pieces of information. It's helpful to think about just going one level above the child's MLU and not having a whole, massive expansion.

So if the child says "truck stuck," we can say, "yeah, the truck is stuck." Or we can say "stuck in the mud." We get to use our clinical judgment to decide if that is appropriate because if they just say "truck stuck," but their MLU is five, then I think "The blue truck stuck in the mud" might be okay.

That's why we collect that MLU to know what might be appropriate for the student.

Strategy four is to use sentence frames. In SLP Now, we have a Sentence Pack. It's a booklet based on the modified Fitzgerald key. It has nouns verbs prepositions and all the components we use to build a sentence.

And it also includes sentence strips based on Brown's research of all the different utterance types. So you have tons of utterances that you can go with . We also have sentence frames with just like for one MLU, and two, and three, and four, and five. And so you can build sentences with any of the components.

If I notice that the student is only using nouns, or if there's a part of speech that's completely missing, I might strategically try to include that more and expand the utterances in that way. That's, a visual that I really like to use. We grab the icons to create sentences. It's really nice because the pieces are movable, It's a tactile experience too, and the students can build it and then you can point to it as you're modeling.

If the student just says truck, truck, truck, and we're trying to expand from one MLU to two MLU. We have like an icon for truck, and then we have one for stuck, and then we would just build the sentence using those icons. Once the truck is out, we can say truck out or truck in if it's in the mud.

Having those icons is really helpful. Verbal strategies help the majority of my students, but there are those who need something extra.

And including those visuals is something that has worked for a lot of the students. So that's how the Sentence Pack came to be. I also use it for different grammar goals. If they are dropping the auxiliary verbs or if they're having trouble understanding that pronouns replace a noun.

So there's lots of ways that I use that, but it's especially helpful for those MLU goals and for those students who need those extra visuals. And then the fifth strategy, which is just too provide contingent responses and time delay. So we really just wanna give our students space to respond and give them some processing time.

And we don't have to fill every second. It's okay if we have some silence in the session. If a student starts to say something, if they say truck, we can just pause a second and see if they say anything else first.

Or if we turn the page and give them some time to look before we really jump in and start talking at them. So that is just a reminder for myself because I sometimes go a little too fast. In terms of what this would look like actually applied. Let's say we're using the therapy plan an SLP Now for a Little Blue Truck, which is a super sweet story about a truck who gets stuck in the mud.

We like to use literacy based therapy units based on Dr. Ukrainetz's research. The first step is pre-story knowledge activation. We might do a virtual field trip of a farm, and we're gonna be doing a lot of talking during that activity. And we can target the MLU goals during that conversation.

As we're reading, we can model expansions and recasts. The third step is comprehension. We can ask simple WH questions and use those sentence starters in the sentence frames to support the student. And then, the fourth step is focused skill practice.

We often have mixed groups, so we're targeting multiple goals with students. We might have some play-based activities related to little Blue Track. We might be reenacting the story or whatnot. This is a early language unit, so it has play-based activity suggestions and all of that.

So that's how that would work. That's just a peek at how we might incorporate this in a literacy based therapy unit.

And then, a quick recap. We wanna start with a language sample. So we know the students' baseline and we can easily see like, oh, they're only using nouns.

Seeing it on paper helps us come up with a good plan.We want to make sure that we're embedding our practice in meaningful context, whether it's play stories, routines. And we want to model just above the child's level and use those verbal strategies. once I set up parents and teachers with that strategy of modeling one level above and then how to do that, it skyrockets from there. If our students need more support using the Sentence Pack and those sentence frames can be really helpful.

And then also just giving them time to respond using some of that wait time. So those are our strategies that will hopefully help you see meaningful growth in your students when it comes to communicating and building beautiful sentences. Head to the show notes to check out the Sentence Pack and the Therapy Plans. If you're new to SLP now, you can do it for free. if you're a member, type in Sentence Pack to find that download or go to the Therapy Plans to check out Little Blue Truck. I hope this was helpful and we'll see you real soon.