The STACK Model™
Load-Based Capacity Framework
When load exceeds capacity, behavior shifts.
See The STACK Model™ in Action
Watch how load builds and behavior shifts in real situations.
What is the STACK Model™?
Why Good Kids Still Melt Down
Why Reasoning Doesn't Work During Overload
Why After-School Meltdowns Happen
Why Bedtime Meltdowns Happen
The Six Loads That Overwhelm Kids
Start Here: Read a Free Preview
Get a simple introduction to the STACK Model™ and learn how to recognize overload
before behavior escalates.
Understand why behavior shifts.
Learn the six types of load.
Use a quick checklist to spot overload.
Download the Free Parent Preview Guide
If you've ever wondered...
Why did my child explode over something small?
Why does reasoning sometimes make things worse?
Why do meltdowns happen at bedtime or after school?
Many behavioral escalations are not about defiance or motivation.
Too many demands can stack on a child’s nervous system
at the same time.
When load exceeds capacity, behavior shifts.
Throughout the day children experience many kinds of demand.
Sensory input
Thinking demands
Emotional stress
Social interaction
Fatigue
Busy environments
Each one adds load to the nervous system.
Most of the time, children can manage these demands.
But demands rarely occur one at a time.
They STACK.
Why Meltdowns Often Seem Sudden
The final trigger is rarely the full cause.
Small demands accumulate across the entire day until the nervous system crosses its capacity threshold.
Example list:
Morning → poor sleep
School → noise + academics
Afternoon → fatigue + social stress
Evening → homework + sibling conflict
Then one final demand pushes the STACK too high.
The Capacity Threshold
Children have a limited amount of regulatory capacity.
When load remains below this threshold, children can:
Think clearly
Solve problems
Regulate emotions
Cooperate
But when cumulative load exceeds capacity…
behavior shifts.
What Actually Helps
When the STACK is high, reduce load before correction.
1. Pause interpretation
2. Reduce one load layer
3. Support regulation
4. Restore capacity
5. Reintroduce expectations
Regulation before compliance.
Listen to the Full Explanation
Want a deeper understanding of how the STACK Model™
works in real life?
Watch the Free Webinar
The STACK Parent Guide + Worksheets
A system for recognizing overload and lowering the STACK before meltdowns happen.
• Identify your child’s usual stack
• Recognize early overload signals
• Lower load in the moment
• Build a family STACK plan
For Clinicians and Educators
The STACK Model™ is a load-capacity framework developed by licensed psychologist Dr. Mark Bowers to explain how cumulative demands interact with regulatory capacity.
The STACK Model™ is informed by research on:
Cognitive load
Executive function under stress
Nervous system regulation
Resilience and recovery
It is designed as a practical framework for understanding how accumulated demands influence behavior.
Research foundations include work in cognitive load theory (Sweller), executive function under stress (Arnsten; Diamond), and developmental resilience (Masten).
Read the Professional Framework
About Dr. Mark Bowers
Dr. Mark Bowers is a Licensed Pediatric Psychologist and Clinical Director of the Brighton Center for Neurodevelopment. For more than 25 years he has worked with children, adolescents, adults, and families navigating neurodevelopmental differences and emotional regulation challenges.
His work focuses on helping families understand behavior through science rather than shame.
Learn More About Dr. Bowers
Understanding behavior changes how we respond.
When parents recognize overload, they can intervene earlier
and support regulation more effectively.