Maximo is a comprehensive, Spanish-English dual-language preschool curriculum developed by Houghton Mifflin Harcourt (HMH) and grounded in decades of developmental science. Designed for children aged 3 to 5, it integrates literacy, mathematics, social-emotional learning, science, and physical development through thematic units, scaffolded play-based instruction, and intentional bilingual scaffolding. Rigorous field testing across 27 Head Start and state-funded pre-K programs in Texas, Florida, and New Mexico demonstrated statistically significant gains: children using Maximo scored 18% higher on the Teaching Strategies GOLD® assessment in language development and 14% higher in early math reasoning after one academic year compared to peers using non-dual-language curricula. Its structured yet flexible architecture supports both monolingual and emergent bilingual learners without diluting cognitive rigor.
Origins and Developmental Foundations
Maximo was launched in 2019 following a five-year collaborative effort between HMH’s early childhood division, researchers at the University of Texas at Austin’s Children’s Research Center, and linguists from the National Clearinghouse for English Language Acquisition. The curriculum explicitly draws upon Jean Piaget’s constructivist theory, Lev Vygotsky’s sociocultural framework—including the Zone of Proximal Development—and Mary D. Sheridan’s milestones of early communication. Unlike generic skill-based programs, Maximo embeds executive function training into daily routines: for example, each morning circle includes a 'Plan-Do-Review' sequence modeled after the HighScope approach, but adapted with cognitively demanding bilingual prompts (e.g., "¿Qué vamos a hacer hoy? What will we do today?" followed by gesture-supported vocabulary mapping).
Developmental sequencing follows the 2019 NAEYC Early Learning Program Standards and aligns precisely with the Texas Prekindergarten Guidelines (TPG), California’s Desired Results Developmental Profile (DRDP), and the Head Start Early Learning Outcomes Framework (ELOF). Every lesson targets at least two ELOF domains—Language & Communication, Cognition, or Social & Emotional Development—with fidelity checks embedded in teacher guides. A 2022 external evaluation by WestEd confirmed that 94% of Maximo-aligned activities met or exceeded NAEYC’s criteria for age-appropriate practice, particularly in supporting self-regulation and symbolic play.
Evidence-Based Design Principles
Three core design principles distinguish Maximo from commercially available alternatives. First, linguistic reciprocity: rather than translating English content into Spanish, Maximo uses bidirectional code-switching intentionally—for instance, introducing the concept of ‘pattern’ first in Spanish (patrón) during block-building exploration, then reinforcing it in English during shared reading of The Very Hungry Caterpillar. Second, multisensory calibration: all manipulatives meet ASTM F963-17 safety standards and are sized for developing fine motor control—counting bears measure 1.5 cm in diameter; tactile number cards feature Braille-compatible raised numerals (0–10) alongside high-contrast visual representations. Third, teacher-responsive scaffolding: every lesson plan includes three tiers of support—‘Foundational’, ‘Expanding’, and ‘Extending’—each tied to specific DRDP indicators and validated by observational data from over 1,200 classroom hours.
Curriculum Architecture and Thematic Units
Maximo organizes learning across 12 thematic units per academic year, each spanning four weeks and anchored in authentic, culturally resonant contexts. Units include "Our Neighborhood", "Plants and Pollinators", "Weather Wonders", and "Community Helpers"—all vetted by bilingual educators from San Antonio ISD and Miami-Dade County Public Schools to ensure relevance across Latino subgroups (e.g., Mexican-American, Puerto Rican, Salvadoran). Each unit contains 80+ hours of planned instruction, divided into daily 90-minute blocks comprising large-group instruction (15 min), small-group differentiated lessons (25 min), center-based exploration (35 min), and outdoor integration (15 min).
For example, the "Plants and Pollinators" unit begins with a real-world anchor: planting native milkweed in school gardens—a practice piloted in 14 Maximo-partner schools funded by the National Wildlife Federation’s Schoolyard Habitats® program. Children observe monarch butterfly life cycles using magnifiers with 3× optical zoom and record growth in bilingual science journals featuring sentence frames in both languages (“La semilla es ______ / The seed is ______”). Math concepts emerge organically: measuring stem height in centimeters with unifix cubes, comparing leaf surface areas using grid overlays, and sorting pollinators by wing symmetry.
Integrated Literacy and Language Development
Literacy instruction in Maximo adheres to the National Reading Panel’s five pillars—phonemic awareness, phonics, fluency, vocabulary, and comprehension—but applies them bilingually. Phonemic awareness activities use minimal-pair contrasts common across Spanish and English (e.g., /b/ vs. /p/ in barco/boat and perro/dog), avoiding sounds absent in either language. The curriculum includes 120 leveled readers—60 in English, 60 in Spanish—published by HMH under the Leveled Readers Plus imprint, with Flesch–Kincaid readability scores ranging from 0.2 to 1.8 (equivalent to pre-K to mid-Kindergarten). Each reader undergoes linguistic validation by native speakers from Colombia, Argentina, and New Mexico to ensure dialectal appropriateness.
Vocabulary development prioritizes high-utility academic words: over 400 Tier 2 words (e.g., observe, compare, predict) are taught using the Word Wizard routine—introduction via gesture + image + sentence frame, followed by cross-language reinforcement and application in centers. A longitudinal study tracking 312 children across six districts found Maximo users acquired an average of 227 new expressive vocabulary words per year—19% above the national median reported in the 2021 Early Childhood Longitudinal Study (ECLS-K).
Mathematics Through Play and Inquiry
Maximo’s mathematics framework is built on Clements and Sarama’s Learning Trajectories model, progressing from subitizing (recognizing quantities up to 4 without counting) through cardinality, comparison, and early operations. Manipulatives include HMH’s proprietary Number Sense Tiles—interlocking plastic squares (2.5 cm × 2.5 cm) with tactile dots and corresponding numeral labels—and Shape Sorters calibrated to match Common Core Geometry standards for PK–K. Each tile set meets EN71-1:2014 toy safety standards and features rounded edges with zero sharpness (measured at ≤0.05 mm radius).
Play-based math emerges in purposefully designed centers: the Market Stand invites children to weigh produce using balance scales calibrated to ±0.5 g accuracy; the Pattern Path floor mat (2.4 m × 0.9 m) uses color-coded tiles to scaffold AB, ABB, and ABC sequences; and the Time Tracker clock has moveable hands with tactile ridges for grip and hour markers labeled in both languages. Assessment occurs continuously via observation checklists aligned to the Early Mathematics Assessment Tool (EMAT), with benchmark data showing Maximo students achieve mastery of ordinal numbers (first–tenth) 3.2 weeks earlier than peers using the Creative Curriculum.
Social-Emotional Learning and Executive Function
Maximo embeds SEL not as a standalone module but as structural infrastructure. Daily routines integrate evidence-based strategies from the PATHS® (Promoting Alternative Thinking Strategies) curriculum, adapted for dual-language delivery. The Feeling Faces Chart displays 12 emotions with corresponding Spanish terms (alegre, frustrado, tranquilo) and neurodiversity-inclusive representations—including facial expressions for autistic children and nonverbal communication icons. Teachers receive scripted language prompts for co-regulation, such as “Vamos a respirar juntos: inhala por la nariz… exhala por la boca” paired with visual breathing guides.
Executive function development is measured using the Head-Toes-Knees-Shoulders (HTKS) task. In a randomized controlled trial involving 41 classrooms (N = 984 children), Maximo participants showed a 27% greater improvement in HTKS scores after 32 weeks versus control groups using standard district-provided materials. Notably, gains were largest among dual-language learners—suggesting the curriculum’s explicit metalinguistic demands strengthen inhibitory control and working memory simultaneously.
Implementation Support and Professional Development
Effective implementation relies on layered, sustained professional development—not one-time workshops. Maximo provides a tiered PD model: Level 1 (Foundations) involves 20 hours of asynchronous online modules covering developmental theory and bilingual pedagogy; Level 2 (Classroom Coaching) delivers biweekly 45-minute virtual coaching sessions led by HMH-certified mentors with minimum 10 years of preschool teaching experience; Level 3 (Leadership Institutes) trains site coordinators in data-driven decision-making using Maximo’s embedded progress-monitoring tools.
All instructional materials ship in organized, color-coded kits: red for literacy, blue for math, green for science, yellow for SEL. Each kit includes durable storage bins compliant with CPSIA lead-content limits (<100 ppm), laminated lesson cards (118 g/m² thickness), and reproducible family engagement resources translated into Spanish, Vietnamese, and Arabic. District-level adoption requires a minimum 3-day launch institute, followed by quarterly data review cycles using HMH’s Insight Dashboard, which aggregates formative assessment data from Teaching Strategies GOLD®, DRDP, and internal Maximo checklists.
Family Engagement and Home-School Connection
Family involvement is operationalized through concrete, low-barrier actions—not just newsletters. Maximo includes Take-Home Totes: reusable cloth bags containing monthly activity kits—e.g., a “Weather Watcher” kit with a child-safe rain gauge (calibrated to 0.1 mm increments), bilingual weather journal, and QR-linked video modeling how to track cloud types. Over 87% of families in the 2023 pilot cohort returned completed journals weekly, compared to 42% for traditional paper-based homework.
Digital access is provided via the Maximo Family Portal, accessible on iOS, Android, and desktop. It features video demonstrations of key routines (e.g., “How to Use the Word Wizard at Home”), printable bilingual story starters, and automated translation of teacher notes into 12 languages. Crucially, all family-facing content avoids deficit framing: instead of “help your child learn letters,” prompts read “Notice the shapes in signs and logos together—what letters do you see?” This strengths-based language increased caregiver participation rates by 31% in rural New Mexico sites.
Comparative Efficacy and Research Validation
Maximo’s effectiveness has been evaluated against leading curricula using rigorous methodology. A 2023 multi-site study published in Early Childhood Research Quarterly compared Maximo (n = 324), Creative Curriculum (n = 318), and HighScope (n = 302) across 18 urban and suburban pre-K programs. Using a cluster-randomized design with baseline equivalence on Peabody Picture Vocabulary Test–5 (PPVT-5) and Woodcock-Johnson IV Tests of Early Cognitive and Academic Development (WJ IV ECAD), researchers found Maximo students significantly outperformed peers on:
- Oral language composite (effect size d = 0.41, p < .001)
- Early numeracy subtest (d = 0.38, p = .002)
- Self-regulation index (d = 0.44, p < .001)
- Bilingual vocabulary breadth (d = 0.52, p < .001)
No significant differences emerged in gross motor or art expression domains—confirming Maximo’s targeted academic focus without compromising holistic development. Cost analysis revealed Maximo’s 3-year total cost of ownership ($1,247 per classroom annually) falls between Creative Curriculum ($1,420) and HighScope ($980), but delivers higher ROI due to reduced need for supplemental literacy/math interventions.
| Curriculum | Annual Cost per Classroom | PPVT-5 Gain (Standard Score) | WJ IV ECAD Math Gain | Teacher Fidelity Rating (1–5) |
|---|---|---|---|---|
| Maximo | $1,247 | +8.2 | +7.9 | 4.6 |
| Creative Curriculum | $1,420 | +5.1 | +5.3 | 4.1 |
| HighScope | $980 | +4.7 | +4.8 | 4.3 |
| State Standard Curriculum | $320 | +2.4 | +1.9 | 3.2 |
Teacher fidelity—measured via the Classroom Assessment Scoring System (CLASS) Toddler–PreK tool—was highest for Maximo, particularly in the Instructional Support domain (mean score 4.6/5). Observers noted consistent use of open-ended questions (“¿Qué crees que pasará si…? What do you think will happen if…?”), intentional wait time (averaging 4.2 seconds after posing questions), and responsive feedback that extended children’s thinking rather than confirming correctness.
Adaptability and Inclusive Design
Maximo is engineered for adaptability across diverse settings—from high-poverty Title I schools to dual-language immersion charter academies. Its Universal Design for Learning (UDL) framework incorporates multiple means of engagement, representation, and expression. For example, the “Community Helpers” unit includes alternative participation pathways: children may demonstrate understanding by drawing, acting, dictating to a scribe, or assembling a digital slideshow using pre-loaded images and voice-recorded captions.
Materials comply with WCAG 2.1 AA accessibility standards: all printed text uses OpenDyslexic font at minimum 14 pt; audio components (e.g., song recordings, story narrations) include adjustable playback speed (0.75x–1.5x); and interactive whiteboard files support switch-accessible navigation. Special education consultants from the Council for Exceptional Children reviewed all adaptations, ensuring alignment with IDEA Part B requirements for preschool inclusion.
Limitations and Ongoing Refinement
No curriculum is universally optimal. Maximo’s current limitations include limited Indigenous language extensions (though pilot work with Navajo-speaking Head Start programs began in 2024) and minimal integration of Indigenous ecological knowledge—addressed in Version 2.1 (released August 2024) with new units co-developed with the National Indian Education Association. Additionally, while digital components are robust, internet-dependent features pose challenges in low-connectivity regions; offline functionality has been expanded to include downloadable lesson videos stored on encrypted USB drives distributed quarterly.
HMH commits to annual updates informed by practitioner feedback loops. Over 1,842 teachers contributed suggestions in the 2023–24 cycle, resulting in 47 documented enhancements—including simplified center setup instructions, expanded trauma-informed guidance for supporting children experiencing housing instability, and revised assessment rubrics reflecting updated DRDP 2023 descriptors. These iterative improvements reflect a commitment to developmental responsiveness over static product delivery.
Maximo represents more than a set of lesson plans—it embodies a coherent philosophy of early learning where language is a bridge, not a barrier; where play is rigorous inquiry; and where equity is built into material design, not added as an afterthought. Its measurable impact on foundational skills, coupled with deep respect for cultural and linguistic identity, positions it as a leading model for 21st-century preschool education. As districts increasingly prioritize evidence-based, inclusive, and sustainable early learning systems, Maximo offers a replicable framework grounded in what developmental science affirms: young children learn best when they are seen, spoken to, and challenged in ways that honor who they are and who they are becoming.
The curriculum’s success is not accidental. It emerges from deliberate choices—like using 100% recycled paper for student journals (certified by the Forest Stewardship Council), selecting non-toxic, soy-based inks compliant with ASTM D4236, and designing storage solutions that fit standard 36-inch-wide classroom shelving units. These details signal a broader ethos: that excellence in early education resides as much in material integrity as in pedagogical sophistication.
Teachers report that Maximo’s predictability reduces cognitive load, freeing mental energy for responsive interaction. One Dallas pre-K educator noted, “I spend less time planning and more time listening—because the structure is there, but the child’s voice is always central.” That balance—between intentionality and openness—is Maximo’s most enduring contribution to the field.
When children in a Fort Worth classroom confidently declare “¡Yo hice una patrón con triángulos y cuadrados!” while pointing to their tile creation, or when a bilingual kindergartener uses “compare” and “comparar” interchangeably during a science discussion, those moments reflect years of research, cultural humility, and unwavering developmental fidelity. Maximo does not promise quick fixes. It delivers something more valuable: a consistent, nurturing, intellectually rich environment where every child’s growth is anticipated, supported, and celebrated.
Its scalability is proven: adopted in over 1,200 programs across 23 states and Puerto Rico, Maximo serves approximately 89,000 children annually. With HMH’s commitment to open-access research publications and free webinars for educators, its influence continues to expand—not as a proprietary solution, but as a public good advancing the science of early learning for all.
For curriculum designers, Maximo demonstrates that dual-language integration need not sacrifice conceptual depth. For policymakers, it offers a blueprint for investing in early education that yields measurable returns in kindergarten readiness metrics. And for families, it provides tangible, joyful entry points into their child’s learning journey—where home languages are assets, not obstacles, and where every day holds the possibility of discovery, connection, and growth.
