The 5E model is a five-phase lesson structure designed to teach science through inquiry rather than lecture. Developed by the Biological Sciences Curriculum Study (BSCS) in the late 1980s, the model walks students through a specific sequence: Engage, Explore, Explain, Elaborate, and Evaluate. Each phase builds on the last, moving students from curiosity to hands-on investigation to formal understanding. It’s one of the most widely used instructional frameworks in science education today, and a large meta-analysis of 61 randomized controlled trials found it produces a strong positive effect on student science outcomes.
Where the 5E Model Came From
The 5E model didn’t appear out of nowhere. It evolved from an earlier framework called the learning cycle, developed by Robert Karplus and Herbert Thier for the Science Curriculum Improvement Study in the 1960s. That original cycle had three phases: exploration, concept introduction, and concept application. Roger Bybee and his colleagues at BSCS expanded it into five phases, drawing on cognitive psychology, constructivist learning theory, and the developmental work of Jean Piaget.
The core idea behind all of this is constructivism: students don’t absorb knowledge passively from a teacher’s lecture. They build understanding by interacting with materials, testing ideas, and revising their thinking based on evidence. The 5E model structures a lesson so this process happens naturally, in a deliberate order. The sequence matters. Students investigate before they receive formal explanations, which means they arrive at vocabulary and definitions with real experience to anchor those terms to.
Phase 1: Engage
The Engage phase is short and designed to do two things: spark curiosity and surface what students already think they know. A teacher might pose a surprising question, show a puzzling demonstration, or present a brief scenario that doesn’t quite make sense yet. The point isn’t to teach new content. It’s to create a gap between what students expect and what they observe, making them want to figure out what’s going on.
This phase also serves a diagnostic purpose. By listening to how students respond, the teacher gets a snapshot of their existing ideas and misconceptions. Those prior conceptions become the raw material the rest of the lesson works with. Students aren’t blank slates; they walk in with assumptions about how the natural world works, and the Engage phase brings those assumptions to the surface where they can be tested.
Phase 2: Explore
In the Explore phase, students get their hands on materials and investigate the concept directly. This might look like a lab activity, a simulation, a field observation, or a structured experiment. The key feature is that students are doing the thinking. They collect data, notice patterns, make predictions, and compare results with their peers. The teacher’s role shifts from lecturer to facilitator, asking guiding questions and keeping groups on track without giving away answers.
This is where the constructivist foundation of the model is most visible. Students are building their own understanding from direct experience. They’re encountering evidence that may confirm or contradict their initial ideas from the Engage phase, and they’re beginning to reorganize their thinking. The messiness is intentional. Students are supposed to grapple with uncertainty before anyone introduces formal terminology.
Phase 3: Explain
The Explain phase has two distinct parts. First, students share what they observed and what sense they made of it. They describe patterns they noticed, propose explanations, and compare their reasoning with classmates. This gives the teacher a window into how student thinking has shifted since the Explore phase.
Second, the teacher introduces formal scientific language, definitions, and concepts. This is the phase where vocabulary gets its official name and where the teacher can correct lingering misconceptions through mini-lectures, readings, videos, or other resources. The critical difference from traditional instruction is timing: students encounter the formal explanation after they’ve already wrestled with the phenomenon. The vocabulary sticks because it labels something students have already experienced, rather than describing something abstract they’ve never seen.
Phase 4: Elaborate
Elaborate pushes students to apply their new understanding to a different context. If the Explore phase involved investigating how dissolved salt affects the boiling point of water, the Elaborate phase might ask students to predict what happens with sugar, or to explain why roads are salted in winter. The goal is transfer: can students use the concept beyond the specific scenario where they first learned it?
This phase often involves more complex problems, real-world applications, or connections to other science topics. It deepens understanding by forcing students to adapt what they’ve learned rather than simply repeat it. A student who can only recall a definition hasn’t truly grasped the concept. A student who can use it to explain something new has.
Phase 5: Evaluate
Evaluation in the 5E model isn’t limited to a test at the end. It includes both ongoing formative checks throughout the lesson and a summative assessment at the close. Formative assessment might look like the teacher circulating during the Explore phase and listening to group conversations, or asking students to sketch a quick diagram of their current thinking. These informal checks help the teacher adjust instruction in real time.
Summative assessment in this model tends to go beyond multiple-choice questions. Students might create a short teaching video explaining the concept, analyze a case study, build a visual model, present findings to the class, or complete a collaborative project. The emphasis is on demonstrating understanding rather than recalling facts. Peer review activities, where students evaluate each other’s work against clear criteria, are also common in this phase.
How Effective Is It?
The evidence for the 5E model is strong. A systematic review and meta-analysis published in SAGE Journals examined 61 randomized controlled trials covering 156 effect sizes. The overall effect on science outcomes was 0.82, which in educational research counts as a large effect. For context, an effect size of 0.40 is often considered the threshold for a meaningful educational intervention, so 0.82 roughly doubles that benchmark. About 70% of the studies in the review met the What Works Clearinghouse standards for research quality.
That said, the researchers noted a large amount of variation across studies, meaning the model doesn’t produce identical results everywhere. How well it works depends on factors like teacher preparation, how faithfully the phases are followed, and how much time is available. Skipping or rushing the Explore phase, for example, undercuts the entire logic of the model. The sequence is designed so that each phase sets up the next, and rearranging or compressing it weakens the effect.
The 7E Expansion
Some educators use an expanded version called the 7E model, proposed by Arthur Eisenkraft. It splits the Engage phase into two parts, Elicit and Engage, and adds an Extend phase after Evaluate. The Elicit phase makes surfacing prior knowledge its own explicit step rather than folding it into the hook activity. The Extend phase emphasizes transfer of learning to genuinely new contexts, going beyond the elaboration that happens in the original model.
The 7E model doesn’t replace the 5E. It’s better understood as a more detailed version of the same framework, designed to remind teachers not to rush past two steps that are easy to shortchange: finding out what students already believe, and making sure they can apply new knowledge outside the original lesson. For most classrooms, the 5E model provides a complete and practical structure. The 7E version simply makes two of its implicit goals more visible.