Reference library
Key concepts for teaching emergent bilinguals
The foundational theory behind the practice, in plain language for new teachers. Each concept explains the big idea, why it matters for emergent bilingual students, a classroom takeaway, a common misconception to avoid, and its research basis.
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Communication & language foundations
The Communication Process
At its heart, teaching is an act of communication, and the classic models give us a practical map of how that act unfolds. A sender starts with an idea, turns it into words, gestures, and images (encoding), routes it through a channel, and a receiver reconstructs meaning from those signals (decoding). Two forces decide whether the exchange works: noise, which is anything that distorts the signal in transit, and feedback, which is the receiver's response telling the sender whether the idea actually landed. A later and essential refinement adds that a message only takes hold where the sender's and receiver's experiences overlap. For a teacher, the takeaway is humbling and useful: the message you intend is not automatically the message a student receives. The job is to build the message so the specific learner in front of you can decode it, then read their feedback to confirm it worked and re-shape it when it did not.
Communicative Competence
Communicative competence answers a deceptively simple question: what does it actually mean to know a language? Knowing a language is more than storing its grammar rules and word lists. It is the ability to use the language to make meaning with real people, in real situations, in ways that are both accurate and appropriate to the moment. Building on Hymes's insight that "knowing" includes social appropriateness, Canale and Swain mapped this ability into working parts that teachers can plan for and observe: grammatical competence (sounds, words, and sentence structure), sociolinguistic competence (reading the situation and adjusting to who you are speaking with and why), strategic competence (the repair moves you reach for when words run out, such as rephrasing, gesturing, or asking for help), and later discourse competence (linking sentences into a coherent whole, such as a story, an argument, or an explanation). A learner can be strong in one part while another is still developing, which is why a student might produce a grammatically clean sentence yet miss a social cue, or have rich ideas to share yet not yet have the precise words to express them.
Translanguaging
Translanguaging starts from a simple but powerful claim: a bilingual person does not store two sealed-off languages side by side. They draw on one shared store of words, sounds, grammar, and meaning, and they reach into all of it when they communicate. So when a student hears a question in English, reasons it out in Spanish, and answers back blending the two, that is not a breakdown or a bad habit. It is a capable bilingual brain doing exactly what it does well. The shift this asks of teachers is to stop treating the home language as interference to be cleared away and start treating it as one of the richest resources a student walks in the door already owning.
How a second language is acquired
Acquisition vs. Learning
Krashen proposed that a new language develops along two separate routes. Acquisition is the subconscious route, the kind of growth that happens while we are absorbed in understanding messages that matter to us, similar to the way a child grows into a first language without ever studying it. Learning is the conscious route, what happens when someone explains the rules, names the verb tenses, or marks a worksheet. Krashen argued that fluent, spontaneous communication springs mainly from acquisition, while consciously learned knowledge plays a narrower part, helping us check and refine what we produce when we have time to reflect. For the classroom, this means language grows most when students are making sense of rich, relevant communication, with rule explanation kept in a supporting role.
Comprehensible Input & i+1
A new language grows mostly out of understanding messages, not out of memorizing rules. When a learner is following what is being communicated, their mind absorbs the language as a byproduct of pursuing the meaning, even when some of the words or grammatical forms are still unfamiliar. Krashen named the target zone "i + 1": the "i" is the learner's current ability, and the "+1" is language reaching just slightly past it, close enough to grasp with help from context, images, gestures, demonstrations, and what the learner already knows. The teacher's job is not to thin out the language but to make full, grade-level language understandable. When learners can follow you, acquisition has room to happen; when the message arrives as undifferentiated noise, very little takes hold.
The Affective Filter
Picture a dial inside each learner that controls how much of your instruction actually reaches the part of the mind that builds new language. When a student feels safe, motivated, and capable, that dial turns down and understandable English flows in. When a student feels anxious, exposed, or unwelcome, the dial turns up and even your clearest teaching is held at the door. The takeaway for a new teacher is that emotion is not a side issue in language learning; it regulates how much of your lesson gets through at all. So your job has two parts: make the English understandable, and make the room feel safe enough for that understandable English to land.
Stages of SLA & the Silent Period
Acquiring an additional language tends to follow a roughly predictable developmental path rather than happening all at once. Teacher-preparation literature commonly maps this path across stages that move from a comprehension-heavy beginning, often called the silent period, toward short phrases, then sentences, then increasingly flexible and academic use of the language over time. A central insight is that understanding outpaces speaking: a student who is not yet talking much may already be following a great deal of what is happening in the room. Because learners travel this path at different rates, the teacher's role is to pitch tasks to where a student is right now and to invite, not force, production. The stages describe growth that is already underway, not a checklist a student must complete to prove ability.
Comprehensible Output
Taking in understandable language is necessary for acquisition, but Merrill Swain argued it is not enough on its own. Learners also need frequent, purposeful chances to produce the language through speaking and writing for a real audience. When a learner tries to express a genuine idea and bumps up against words or structures they have not fully mastered, they become aware of the distance between what they mean and what they can currently say. Swain called this "pushed output," and she saw it as a driver of growth rather than a byproduct of it: stretching to communicate prompts learners to test their guesses, attend more closely to how the language works, and refine it. In short, output is not only evidence that acquisition has happened, it is one of the engines that makes it happen.
Interaction & Negotiation of Meaning
A new language develops fastest through genuine two-way conversation, not through silent listening alone. When two people talk and one of them does not fully grasp the message, they work it out together: they ask what a word means, repeat themselves, slow down, rephrase, gesture, or check that they were understood. Michael Long called this collaborative repair the negotiation of meaning and argued that it is one of the most powerful drivers of language acquisition. It works because the conversation is continuously adjusted in real time until the message becomes clear, so the learner receives input shaped to exactly what they can use right then. The classroom implication is direct: talk is not a prize students earn after they learn English; talk is how the learning happens.
Language proficiency & transfer
BICS vs. CALP (and the academic-language debate)
Jim Cummins noticed that emergent bilingual students often sound comfortable in everyday English long before they can handle the reading, writing, and reasoning that school tasks ask of them. He named the everyday, conversational side BICS (Basic Interpersonal Communicative Skills) and the school-and-text side CALP (Cognitive Academic Language Proficiency). The heart of his message to teachers concerns timelines and patience. Conversational comfort frequently shows up within roughly one to two years, while the academic language a student needs to thrive across subjects can take five years or more to mature. The pairing has stayed useful because it protects against a genuine error, namely assuming that a confident, chatty student no longer needs any language support. Many scholars, though, question the idea that academic language is one general thing a learner either has or does not have. They argue it is better understood as the particular language that each task and each subject calls for. The workable synthesis is to keep Cummins's patience about long timelines while asking, for every specific lesson, what language a student needs in order to take part fully right now.
Common Underlying Proficiency & Linguistic Interdependence
A bilingual person does not run two separate engines, one per language. On the surface, two languages can look unrelated because their sounds, spellings, and grammar differ. Below the surface, though, the thinking, conceptual knowledge, and literacy abilities that power both languages draw on one shared system. A useful picture is an iceberg with two peaks above the waterline: the peaks look distinct, yet they rest on a single submerged mass. Because that base is shared, an idea worked out or a reading strategy mastered in one language is not locked inside it. Reasoning, background knowledge, and how-to-read-and-write skills become available to the other language as well, so a learner builds on them rather than rebuilding them from scratch.
Cummins's Quadrants (cognitive demand x context)
Cummins offered teachers a simple way to read any task along two independent dials. One dial measures how much thinking the task demands, ranging from routine and automatic to genuinely challenging. The second dial measures how much the situation itself helps a learner build meaning, ranging from context-rich (pictures, gestures, objects, a face-to-face partner, a shared activity) down to context-reduced (bare words on a page with no clues to lean on). Because the two dials operate independently, they cross to create four quadrants. The productive target for emergent bilinguals is the quadrant that keeps the thinking high while surrounding the task with supportive context. The hardest tasks fall where heavy cognitive load meets stripped-down context, which is exactly where cold academic reading and high-stakes testing tend to sit.
Asset-based & sociocultural foundations
Zone of Proximal Development & Scaffolding
Picture two markers of what a learner can do. One marks what they handle confidently on their own. The other marks what they can accomplish when a more experienced partner steps in to help. The distance between those two markers is the Zone of Proximal Development, and it is the sweet spot for instruction: not so easy the task is already mastered, not so hard it is out of reach. Scaffolding is the support you provide inside that zone, offered at the right moment and in the right amount, such as a sentence frame, an image, a brief demonstration, or a well-placed question that moves thinking along. What makes it a scaffold rather than a permanent feature is that it is designed to come off. As the learner takes over more of the work, you ease the support away. Underneath both ideas is a claim about how learning works: we grow first by doing things together with others, and only later make that thinking our own.
Funds of Knowledge
Over time, every household develops a practical body of knowledge and skills that gets handed down across generations and that the family relies on to live well and meet real needs. That know-how might include growing or preparing food, building and repairing things, fixing a car, handling money, using home or plant remedies, practicing a faith, making music, caring for younger siblings, or keeping a small business going. Calling this "funds of knowledge" is a deliberate claim that such expertise is real, valuable, and intellectually serious, not just background detail or trivia. Once teachers learn what their students and families actually know how to do, they can design instruction that ties new academic content to knowledge students already carry. The home shifts from being seen as empty to being recognized as a source teachers can teach from.
Additive vs. Subtractive Bilingualism
A student does not have to give up the home language to gain English; the two can grow side by side. When a school treats English as a language added on top of a home language that keeps developing, the outcome is additive bilingualism, a pattern researchers link to stronger academic achievement, cognitive flexibility, and a secure sense of self. When schooling pushes English in ways that crowd the home language out until it fades, the outcome is subtractive bilingualism, which carries real social and academic costs. The idea a new teacher should hold onto is that which path unfolds is shaped largely by the environment, not by the child. Many emergent bilinguals are building two languages at the same time, so the home language calls for active support rather than quiet neglect, and everyday classroom choices help steer the result.
Legal Foundations of Emergent Bilingual Rights
Building lessons that emergent bilingual (EB) students can genuinely enter is not a favor or an add-on. It is a civil right that federal law and the U.S. Supreme Court have protected for fifty years. The logic is simple. When a student is still developing English, handing them the same text, lecture, and pace as a fluent classmate quietly locks them out of the education the school is legally bound to deliver. Real equality means giving each learner a way into the material they can understand, not handing everyone identical inputs and labeling that fairness. A series of court decisions and federal statutes built this protection, and in Texas it becomes day-to-day practice through the English Language Proficiency Standards (ELPS), which every certified teacher in every content area is required to implement.