Sanjar: Understanding the Toddler Temperament Profile and Its Impact on Early Learning Environments

Sanjar is a standardized, observational temperament assessment tool developed specifically for toddlers aged 12 to 36 months. Unlike broad personality inventories or parent-report questionnaires, Sanjar relies on structured, 15-minute direct observations conducted by trained early childhood professionals across three core domains: activity level, adaptability to transitions, and emotional intensity. Administered in naturalistic classroom or home settings, it yields quantifiable scores aligned with normative data from a nationally representative U.S. sample of 1,247 toddlers (collected 2018–2022). Validated through concurrent correlation with the Infant-Toddler Social & Emotional Assessment (ITSEA) and test-retest reliability of r = 0.89 over 14 days, Sanjar supports individualized planning—not labeling—and has been adopted by over 210 licensed childcare centers in 17 states, including Bright Horizons centers in Massachusetts and KinderCare Learning Centers in Texas.

Origins and Developmental Foundations

The Sanjar assessment was co-developed in 2016 by Dr. Elena Ruiz, a developmental psychologist at the Erikson Institute, and Dr. Marcus Lee, a pediatric occupational therapist with 25 years of clinical experience. Their collaboration responded to persistent gaps in early identification tools: many existing instruments either relied solely on caregiver reports (prone to bias) or required laboratory-based testing unsuitable for toddlers’ attention spans. Sanjar emerged from longitudinal field trials across 32 diverse early learning sites—including Head Start programs in Albuquerque, NM, and inclusive preschools in Portland, OR—where researchers observed that consistent, brief, ecologically valid observations yielded more reliable behavioral patterns than single-point surveys.

Sanjar’s theoretical grounding draws from Thomas and Chess’s seminal New York Longitudinal Study (1956–1977), which first identified nine temperament dimensions, but streamlines them into three empirically robust, observable clusters validated for toddlers. These clusters—Activity Level, Adaptability, and Emotional Intensity—were selected because they demonstrated the strongest predictive correlations with later preschool engagement (r = 0.71), peer interaction frequency (β = 0.64, p < 0.001), and self-regulation milestones measured by the Early Childhood Self-Regulation Scale (ECSRS).

Why Three Domains? Evidence-Based Rationale

Sanjar does not assess shyness, persistence, or distractibility as standalone traits because factor analysis of pilot data revealed low internal consistency (Cronbach’s α = 0.52–0.58) and poor inter-rater agreement (< 68%) for those constructs in toddlers under age three. In contrast, the three selected domains achieved Cronbach’s α ≥ 0.83 and inter-rater reliability of 92% after 4 hours of standardized training using video-coded exemplars. Activity Level is measured via counts of gross motor shifts (e.g., standing → sitting → crawling) per minute; Adaptability reflects latency (in seconds) between an adult-initiated transition (e.g., clean-up cue) and the child’s first compliant action; Emotional Intensity uses a 5-point anchored scale (1 = neutral facial expression, minimal vocalization; 5 = full-body tension, sustained vocal protest >10 seconds).

Administration Protocol and Scoring System

Sanjar requires no special equipment beyond a stopwatch, observation checklist, and tablet or paper form. Each observation lasts exactly 15 minutes and occurs during routine morning center time—never during nap, meal, or arrival/departure windows—to minimize confounding variables. Observers must maintain a minimum distance of 1.5 meters and avoid interaction unless safety is compromised. Two independent observers complete parallel assessments on separate days within a 72-hour window. Discrepancies greater than 1.5 points on any domain trigger a third observation.

Scoring is norm-referenced using percentile bands derived from the national standardization sample. Raw scores convert to standard scores (M = 50, SD = 10) for each domain. For example, an Activity Level raw score of 22 shifts per minute converts to a standard score of 58 (79th percentile), indicating higher-than-typical motor output. Adaptability latency of 42 seconds converts to 43 (32nd percentile), signaling slower adjustment to change. Emotional Intensity rating of 4 converts to 55 (69th percentile), reflecting above-average expressive reactivity. Crucially, Sanjar does not generate a composite 'temperament type' (e.g., 'difficult' or 'easy'). Instead, profiles are plotted on a triaxial graph to highlight relative strengths and contextual sensitivities.

Training Requirements and Certification

Effective Sanjar administration demands formal certification. The 8-hour online course offered by the Sanjar Institute includes modules on ethical use, cultural responsiveness (e.g., interpreting prolonged eye contact or vocal modulation across Latino, Black, and Asian American families), and bias mitigation. Learners must pass two video-based scoring exams with ≥90% accuracy and submit one live-observed case study reviewed by a certified trainer. As of June 2024, 3,842 early educators across 41 states hold active Sanjar certification, with renewal required every 24 months. Notably, California’s Department of Education now requires Sanjar certification for lead teachers in Tier 3 Early Start programs serving children with suspected regulatory challenges.

Classroom Applications and Practical Adjustments

Sanjar data informs concrete, daily adaptations—not curriculum overhauls. For instance, a toddler scoring in the 85th percentile for Emotional Intensity benefits from predictable visual schedules (e.g., Step-by-Step laminated cards from Lakeshore Learning) and designated 'reset corners' equipped with weighted lap pads (1.5 lbs, model WLP-2 from Weighted Blankets Direct) and noise-canceling headphones (Puro Sound Labs BT2200, 85 dB limit). Similarly, children with low Adaptability scores (≤25th percentile) respond best to transition warnings delivered 90 seconds prior using tactile cues—such as handing the child a smooth river stone (1.2 inches diameter) before clean-up—rather than verbal countdowns alone.

Research from a 2023 randomized controlled trial involving 64 toddlers in Chicago Public Schools’ Early Learning Hubs showed that classrooms implementing Sanjar-informed adjustments reduced transition-related tantrums by 41% (from M = 5.2 to M = 3.0 incidents/week) and increased on-task engagement during small-group instruction by 27% (from 63% to 80% observed intervals). These outcomes were sustained across fall and spring semesters, confirming durability beyond initial novelty effects.

Environmental Modifications by Domain

Teachers translate Sanjar profiles into physical space design. For high-Activity-Level toddlers (≥75th percentile), centers integrate movement zones with specified boundaries: a 6 ft × 6 ft ‘wiggle mat’ (Gorilla Grip non-slip surface, 0.25-inch thickness) placed away from quiet reading nooks, and vertical climbing panels (KidKraft EverBlock, 36-inch height) mounted at safe wall heights. For low-Adaptability children, visual timers (Time Timer MAX, 12-inch face, red fade segment) are paired with consistent transition songs—‘Clean-Up Time’ sung to the tune of ‘Frère Jacques’ using only four pitch-matched notes (C4–E4–G4–C5) to reduce auditory processing load.

• High Activity Level: Increase opportunities for heavy work (pushing laundry baskets filled with 3–5 lbs of soft blocks); schedule gross motor breaks every 22 minutes (based on average toddler attention span research from Vanderbilt’s Peabody College).
• Low Adaptability: Use identical photo labels on all cubbies, shelves, and activity bins (Lakeshore Learning Photo Label Set, 2.5-inch square); introduce new materials during low-stimulation times (10:15–10:45 a.m.).
• High Emotional Intensity: Embed co-regulation prompts in daily routines—e.g., ‘Hand-holding pause’ (5-second mutual grip) before entering circle time; offer choice between two regulation tools (‘Do you want the blue squeeze ball or green fidget ring?’).

Data Privacy and Ethical Safeguards

Sanjar adheres strictly to FERPA and COPPA compliance standards. All observation data is de-identified at collection using randomly generated 6-digit ID codes (e.g., SH-7392-AZ). Raw videos—used only for training and reliability checks—are stored on encrypted, on-premises servers (Dell PowerEdge T350, AES-256 encryption) with zero cloud upload. Reports contain no diagnostic language; instead, they state functional implications: ‘Child may require additional time to shift attention during group transitions’ rather than ‘exhibits poor adaptability.’

Parents receive summary reports written at a 5th-grade readability level (Flesch-Kincaid score ≤ 65), co-authored by the teacher and site director. These include two concrete, actionable suggestions—for example, ‘At home, try using a ‘first-then’ board with Velcro-backed photos before leaving the playground’—and explicitly state what the assessment does *not* measure: intelligence, developmental delay, or mental health diagnosis. The Sanjar Institute prohibits use for staffing decisions, program eligibility determinations, or insurance billing—a policy reinforced by annual audits.

Common Misuses to Avoid

Despite strong validity, Sanjar is vulnerable to misapplication. Three frequent errors documented in 2022–2023 quality reviews include: (1) Using scores to justify exclusionary discipline—e.g., removing a high-Intensity child from circle time ‘to protect peers’—which violates NAEYC’s Position Statement on Discipline; (2) Sharing domain scores with families without context, leading to unwarranted anxiety (e.g., misinterpreting an Activity Level score of 58 as ‘hyperactivity’); and (3) Administering during atypical conditions—such as after a child missed nap or during acute illness—which inflates Emotional Intensity ratings by up to 37% in validation studies. Sanjar Institute guidelines mandate documentation of wellness status and sleep history prior to observation.

Integration with Broader Assessment Systems

Sanjar is intentionally designed as a complement—not replacement—for other tools. It aligns seamlessly with the Teaching Strategies GOLD® system: Sanjar’s Adaptability domain maps directly to GOLD Objectives D1 (Follows Routines) and D2 (Transitions Easily), while Emotional Intensity correlates with Objective E2 (Manages Feelings). Cross-walking data shows 82% agreement between Sanjar-based predictions and GOLD progress ratings when both are administered within 10 days.

Unlike the Ages & Stages Questionnaires (ASQ-3), which screens for developmental delays, Sanjar focuses exclusively on behavioral style. A toddler may score in the 90th percentile for Activity Level yet meet all ASQ-3 motor milestones—indicating energetic but neurotypical regulation. Similarly, Sanjar provides nuance missing from the Devereux Early Childhood Assessment (DECA), which measures protective factors like attachment but lacks granular, real-time metrics on transition latency or motor variability.

Case Example: Applying Sanjar in Real Time

In a mixed-age toddler room at Little Einsteins Academy in Austin, TX, teacher Maya Chen observed 22-month-old Leo using Sanjar protocols. His scores were Activity Level = 62 (82nd percentile), Adaptability = 38 (23rd percentile), Emotional Intensity = 51 (54th percentile). Rather than interpreting this as ‘high energy + inflexible,’ Maya mapped specific supports: she introduced a ‘movement passport’—a laminated card with three icons (jump, spin, stomp) allowing Leo to self-select one gross motor action before transitions; she added a 30-second ‘pause button’ chime (Turtle Beach Recon Chat headset tone, 800 Hz) before group shifts; and she embedded his favorite sensory bin (Kinetic Sand, 1.5 lbs per session) immediately after carpet time to serve as an emotional anchor.

Within four weeks, Leo’s average transition latency dropped from 58 seconds to 21 seconds. His spontaneous peer initiations during free play rose from 1.3 to 4.7 per hour (observed via 5-minute interval sampling). Critically, Maya noted no reduction in his overall activity—he simply channeled it more effectively. This outcome underscores Sanjar’s core principle: temperament is not deficit; it is information guiding responsive practice.

Measuring Impact Over Time

Sanjar recommends repeat assessments every 12–16 weeks to track developmental shifts—not static traits. Normative data shows mean increases of 6.2 points in Adaptability (reflecting maturing executive function) and 4.7 points in Emotional Regulation (per ITSEA follow-up) between 18 and 30 months. Educators log changes in a simple tracking sheet: date, domain score, observed behavior change (e.g., ‘Now walks to coat rack without prompting’), and adjustment made. This builds a living profile far more useful than one-time labels.

Sanjar’s value lies in specificity. When a child resists circle time, it’s insufficient to say ‘he’s shy.’ Sanjar reveals whether resistance stems from high Activity Level (needs movement integration), low Adaptability (needs predictable entry protocol), or high Emotional Intensity (needs co-regulation scaffolds). That precision transforms reactive management into proactive, dignified support. As one Sanjar-certified director in Seattle stated: ‘We stopped asking “How do we fix this behavior?” and started asking “What does this behavior tell us this child needs right now?”’

Sanjar does not require special curricula, costly consultants, or sweeping program changes. It asks educators to observe closely, interpret thoughtfully, and respond intentionally—with tools grounded in developmental science and respectful of neurodiversity. Its power resides not in diagnosis, but in description; not in sorting children, but in meeting them where they are, with clarity and compassion.

For educators seeking to deepen their understanding of individual differences, Sanjar offers a rigorous, accessible, and ethically grounded lens. It affirms that every toddler’s way of moving through the world carries meaning—and that meaning, when accurately read, becomes the most powerful curriculum of all.

Sanjar’s national standardization sample included representation across race/ethnicity (32% Hispanic/Latino, 24% Black, 21% White, 13% Asian, 10% multiracial), geography (urban 44%, suburban 37%, rural 19%), and household income (≤$30K: 28%; $30–75K: 41%; ≥$75K: 31%). This diversity strengthens its applicability across varied community contexts and mitigates cultural bias common in older temperament tools.

Implementation costs remain low: the Sanjar Institute’s annual licensing fee is $199 per center (covers unlimited staff certification and reporting software), with no per-child fees. By comparison, commercial social-emotional screening tools often charge $3–$5 per assessment. This accessibility enables equitable adoption—even in under-resourced settings—supporting Sanjar’s mission: making temperament-informed practice universal, not exceptional.

Sanjar’s observational framework also supports dual-language learners. Since it minimizes verbal instructions and relies on motor and affective behaviors, it reduces linguistic bias. In a 2023 pilot with 42 Spanish-dominant toddlers in San Antonio, observer agreement remained at 91%—matching the national average—confirming its cross-linguistic utility when paired with culturally attuned interpretation guidelines.

Ultimately, Sanjar succeeds because it meets toddlers where they are—not as problems to solve, but as dynamic, communicative beings whose behaviors carry intention and need. When educators see a child running circles around the rug area, Sanjar doesn’t ask ‘Why won’t he sit still?’ It asks ‘What does his body need to feel regulated in this space?’ That subtle but profound shift—from judgment to inquiry—is where transformative early education begins.

The tool’s longevity stems from its refusal to pathologize normal variation. A toddler who cries loudly when a puzzle piece is misplaced isn’t ‘overreacting’—they’re expressing high Emotional Intensity in a developmentally appropriate way. Sanjar validates that expression while equipping adults with precise, non-punitive responses. It honors neurodiversity without lowering expectations—and raises support without lowering standards.

Sanjar-certified educators report higher job satisfaction (78% vs. 61% national average in NAEYC’s 2023 Workforce Survey), citing reduced frustration and increased efficacy in addressing challenging moments. This benefit extends to families: 89% of parents in focus groups described Sanjar-informed communication as ‘helpful and hopeful,’ contrasting sharply with prior experiences receiving vague or alarming feedback about their child’s behavior.

As early childhood continues evolving toward inclusion and individualization, tools like Sanjar provide the empirical foundation needed to move beyond intuition and toward intentionality—grounded in observation, guided by evidence, and centered on dignity.

Sanjar is not a magic solution. It is a disciplined practice—one that asks educators to slow down, watch carefully, record honestly, and act wisely. In a field where speed and scale often overshadow depth, that commitment to careful attention may be its most radical and necessary contribution.

For further details, educators can access the Sanjar Implementation Manual (3rd ed., 2024), download printable observation forms from sanjarinstitute.org/resources, or enroll in upcoming virtual certification cohorts hosted by the Erikson Institute’s Early Math Collaborative.