What’s the difference between ELD, bilingual education and other language support models?
A reference for administrators, partner organizations and anyone explaining English Learner program types to schools.
English Learner support in US K-12 schools spans many instructional models, and the terminology can be confusing even within a single district. This article explains the most common models: what they aim to do, where they sit relative to each other and where Off2Class fits.
ELD (English Language Development)
ELD is direct instruction focused specifically on helping ELs learn English. The goal is proficiency across:
- speaking
- listening
- reading
- writing
- academic language
Students receive targeted English instruction in addition to regular classroom content.
Key characteristics
English-focused. All instruction is designed to build English proficiency.
Explicit language teaching. Teachers intentionally teach vocabulary, grammar, sentence structures and academic discourse.
Flexible settings. ELD may occur in a separate class (“pull-out”), inside the regular classroom (“push-in”) or during a designated ELD block.
Usually temporary. Students exit ELD services once they demonstrate sufficient English proficiency.
Designated ELD
Designated ELD is a dedicated block of time set aside specifically for English language instruction, separate from core content instruction. It’s the most common structured EL model in US secondary schools.
Typical structure:
- 30 to 60 minutes daily, often a dedicated class period
- Taught by an ELD specialist or trained teacher
- Students grouped by proficiency level
- Curriculum built around language development goals rather than content learning
When districts choose it:
- They want a predictable, schedulable block for ELD instruction
- They have enough ELs to staff a dedicated class
- They want clear accountability for language growth, separate from ELA grades
- State requirements call for explicit ELD time
How it complements core ELA. Designated ELD doesn’t replace English Language Arts. Students still take ELA with their grade-level peers; Designated ELD provides the language scaffolding (vocabulary, grammar, discourse patterns) that lets them access ELA more successfully.
How it differs from Integrated ELD. In Integrated ELD, language support is embedded inside content classes (math, science, social studies) rather than taught as its own subject. Many districts use both: Designated ELD for the structured language block, plus Integrated ELD for content-area scaffolding.
Integrated ELD
Language support embedded into content-area classes. A science teacher, for example, scaffolds vocabulary and sentence frames for ELs as part of the science lesson.
Integrated ELD is usually paired with Designated ELD rather than replacing it. The combination ensures students get both explicit language instruction and language scaffolding inside content.
Strengths of ELD as a model
- Directly targets English growth
- Flexible to implement across settings
- Works with students from many language backgrounds, with no single home language required
- Scales in multilingual schools where bilingual staffing isn’t feasible
Challenges
- Does not develop the home language
- Students can lose literacy in their first language over time
- Pull-out models can isolate students from grade-level peers
- Quality varies widely with teacher training and curriculum
Bilingual Education
Bilingual education teaches students in two languages: the home language and English. The goal is bilingualism and biliteracy.
Unlike ELD-only approaches, bilingual education values maintaining and developing the student’s first language alongside English.
Transitional Bilingual Education (TBE)
Goal: Use the home language temporarily while transitioning students into English-only instruction.
Characteristics:
- Early instruction partly in the first language
- Gradual shift toward English
- First-language support decreases over time
Strengths: Students access grade-level content immediately, and the transition into English academics is smoother.
Challenges: Often subtractive. The home language may fade as English takes over, and the end goal is typically English dominance rather than lasting bilingualism.
Dual Language / Two-Way Immersion
Goal: Develop full bilingualism and biliteracy for all students.
Programs usually mix English speakers with speakers of another language. Spanish-English is the most common pairing in the US.
Characteristics: Instruction occurs in both languages over many years. Common time splits are 50/50, or 90/10 where the partner language dominates early and shifts toward balance.
Strengths: When well implemented, research shows strong long-term outcomes across bilingualism, biliteracy, academic achievement and cross-cultural competence.
Challenges: Hard to staff well. Requires long-term district commitment. Scheduling and curriculum design are complex, and outcomes depend heavily on implementation quality.
Developmental / Maintenance Bilingual Education
Goal: Maintain and strengthen the home language while developing English.
Unlike transitional models, the home language remains important long term. These programs usually serve multilingual learner populations and focus on lasting bilingualism rather than transition out.
Other Language Support Models
Sheltered Instruction
Grade-level content taught in English, with supports that make it understandable to ELs. Typical supports include visuals, modeling, sentence frames, simplified language and structured peer interaction.
Popular frameworks: SIOP (Sheltered Instruction Observation Protocol) is the most widely used.
Strengths: Helps students access academic content. Can be used in mainstream classrooms across subjects.
Challenges: Students may still need explicit ELD alongside sheltered instruction. Teachers need specialized training to deliver it well.
ESL (English as a Second Language)
ESL overlaps heavily with ELD. Historically, ESL referred to specialized English instruction programs. Today many schools prefer “ELD” because students often speak third or fourth languages, not just a “second” language. Functionally, ESL and ELD describe similar instructional work.
Push-In Support
Language specialists enter the general classroom to support ELs alongside the regular teacher.
Strengths: Students stay with their peers, and language support is integrated with classroom content in real time.
Challenges: Requires strong collaboration between the language specialist and the content teacher. Without that, push-in can default to aide-style support rather than real co-teaching.
Pull-Out Support
Students leave the classroom temporarily for specialized language instruction.
Strengths: Intensive small-group instruction, and easier to differentiate by proficiency level.
Challenges: Students miss core content during pull-out time, and pull-out can feel stigmatizing for some students.
Newcomer Programs
Specialized programs for recently arrived immigrant students. They focus on:
- survival English
- acculturation and orientation to US schooling
- foundational literacy, especially for students with limited or interrupted formal education (SLIFE)
- bridging into mainstream classes
Content-Based Language Instruction
Language is taught through meaningful academic content rather than isolated drills. Students might learn English through science investigations or social studies units.
Heritage Language Programs
Programs designed for students who already have cultural or family ties to a language. The goal is to maintain and deepen heritage-language proficiency rather than develop English. Heritage programs serve a different population than EL programs do; they support students whose families want to preserve a non-English language and they don’t substitute for EL support.
Comparative summary
| Model | Main Goal | Home Language Role | Long-Term Aim |
|---|---|---|---|
| ELD | Learn English | Usually limited | English proficiency |
| ESL | Learn English | Usually limited | English proficiency |
| Transitional Bilingual | Transition to English | Temporary support | English dominance |
| Dual Language | Bilingualism | Central | Biliteracy |
| Maintenance Bilingual | Preserve both languages | Central | Long-term bilingualism |
| Sheltered Instruction | Access content in English | Variable | Academic success in English |
| Newcomer Program | Initial adjustment | Often supportive | Integration into school system |
The big picture
These models sit on a spectrum based on how they treat the home language:
English-focused approaches:
- Pull-out ESL
- ELD (Designated and Integrated)
- Sheltered instruction
Mixed approaches:
- Transitional bilingual education
Bilingual-focused approaches:
- Dual language / two-way immersion
- Maintenance bilingual education
Districts rarely run a single model in isolation. A common US K-12 pattern combines Designated ELD as the structured language block, Integrated ELD inside content classes and a Newcomer program for recently arrived students.
Implementation quality matters more than the label. Two schools running the “same” model can produce very different outcomes depending on staffing, curriculum, scheduling and teacher training.
Where Off2Class fits
Off2Class is built for English Language Development. It works best in models that include dedicated time for English instruction, taught by a teacher.
Models Off2Class supports directly:
- Designated ELD: Off2Class is purpose-built for this model. Lessons are sequenced by proficiency level, paired with embedded Teacher Notes and structured around language development goals rather than content goals. Most Off2Class K-12 districts use it for their Designated ELD block.
- Newcomer programs: The Step-by-Step Curriculum Newcomers and Foundational Literacy curriculum directly serve newly arrived students, including SLIFE.
- Integrated ELD: Off2Class lessons include the visuals, sentence frames and structured discourse that content teachers can use to scaffold language inside content instruction. The Teacher Notes help non-EL specialists deliver language support effectively.
- Push-In and Pull-Out support: Off2Class works in both. ELD specialists can use lessons in pull-out groups, or co-teach with a content teacher in a push-in setting.
- Whole-class and small-group instruction: Lessons are designed for teacher-led delivery to groups, with built-in differentiation tools for mixed-level classes.
- Sheltered instruction: Off2Class lessons embed the scaffolds (visuals, sentence frames, structured interaction) that sheltered instruction relies on, making them useful for content teachers working with ELs.
- MTSS and RTI: Districts use Off2Class as part of their tiered support system, with Placement Tests, level-based curriculum sequencing and progress monitoring.