17.1 Teaching Science and How Students Learn
Key Takeaways
- Grades 4-6 students are typically in Piaget's concrete-operational stage and need manipulatives and observable phenomena before abstract models; grades 7-8 students increasingly reason formally and can handle hypotheses, variables, and proportional reasoning.
- Constructivism holds that learners build new understanding on prior knowledge, so effective science teaching elicits prior conceptions first through prediction, drawing, or KWL before introducing new ideas.
- The 5E instructional model — Engage, Explore, Explain, Elaborate, Evaluate — sequences activities so students investigate a phenomenon before it is named, then apply the concept before being assessed on it.
- Anchoring instruction in students' own communities and daily decisions teaches that scientific evidence can guide civic and personal choices, which is an explicit Competency 021 expectation.
- The framework distinguishes hands-on activity from minds-on inquiry: manipulating materials matters only when students are also generating questions, designing procedures, and interpreting evidence.
How Developmental Characteristics Affect Science Learning
Texas science classrooms span grades 4-8, a range that crosses a major Piagetian transition. Grades 4-6 students are typically in the concrete-operational stage: they can classify, order, and conserve, but they reason best about objects and events they can see and manipulate. A fifth grader can compare the mass of a dry bean and a soaked bean on a balance, but may struggle to explain that the increased mass came from water absorbed through the seed coat — an invisible process. Grades 7-8 students enter the formal-operational stage, gaining the capacity for hypothesis testing, proportional reasoning, and abstract variables. An eighth grader can design a controlled experiment isolating one variable (light intensity) while holding others constant (water, soil, species).
This transition has direct instructional consequences. For grades 4-6, anchor every concept in a hands-on investigation or a concrete model (stream tables for erosion, hand lenses for crystal identification). For grades 7-8, you can introduce abstract representations — particle models of matter, energy-flow diagrams, food webs — once students have observed the phenomenon. Pushing abstract models too early is a primary cause of misconceptions and disengagement.
Constructivism and Prior Knowledge
Constructivism is the theoretical backbone of TExES science pedagogy: learners are not empty vessels but active builders who attach new ideas to existing mental frameworks. If a student believes 'plants eat soil,' instruction that simply states 'plants make food from sunlight' rarely displaces that belief — the new fact sits alongside the old one and resurfaces on the next assessment. Effective teachers elicit prior knowledge first (KWL charts, predict-observe-explain cycles, drawing prompts) so they know what conceptions exist before teaching.
A practical Texas example: before a seventh-grade unit on photosynthesis, ask students to draw where a tree's extra mass comes from as it grows. Many will draw roots pulling material from the soil. That drawing becomes the launching point for the unit — not a misconception to punish, but the starting conception to refine.
Differentiation, emergent bilingual support, accommodations, and inclusive planning are developed in the next section, "Differentiation, Emergent Bilingual Support, and Inclusive Science Instruction."
Using Daily-Life Situations and Informed Decision-Making
Competency 021 asks the teacher to use situations from students' daily lives to investigate how science informs decisions. A Central Texas class studying weathering can investigate why local limestone buildings crumble faster than granite ones, then decide as a class which material to recommend for a school garden wall. A Gulf Coast class can analyze hurricane surge data to evaluate whether a proposed seawall would protect their neighborhood. The point is not relevance for its own sake — it is teaching students that scientific evidence can and should guide civic and personal choices.
Rationale for Active Learning and Inquiry
Active learning is not 'hands-on for its own sake.' The TExES framework distinguishes hands-on (manipulating materials) from minds-on (thinking about the phenomenon). Inquiry is the highest form because students generate questions, design procedures, and interpret evidence — they practice the actual work of scientists. A body of research summarized in the National Research Council's Taking Science to School shows that students in inquiry-based classrooms retain concepts longer and transfer them better than students in verification labs where the outcome is known in advance.
The conceptual-change cycle, a catalog of high-frequency misconceptions, question types, and wait time are developed in "Questioning Strategies and Conceptual Change."
Sequencing Instruction: The 5E Model
Sequencing decides whether students investigate a phenomenon before it is named or after. The 5E model — Engage, Explore, Explain, Elaborate, Evaluate — is the canonical sequence for building on prior knowledge:
| Phase | Teacher role | Student action | Example (seventh-grade photosynthesis) |
|---|---|---|---|
| Engage | Surface prior knowledge; pose a puzzling event | Predict and share ideas | Show a plant grown in a sealed jar; ask where the extra mass came from |
| Explore | Provide materials; observe without direct instruction | Investigate and collect data | Mass dry seeds, soil, and plant after 3 weeks of growth |
| Explain | Introduce vocabulary and models after students have data | Connect evidence to scientific terms | Introduce 'photosynthesis' and 'carbon dioxide' once students notice soil mass barely changed |
| Elaborate | Extend to a new context | Apply the concept | Predict whether a plant in a CO2-enriched chamber grows more |
| Evaluate | Assess with a performance task | Demonstrate understanding | Diagram matter flow into, through, and out of the plant |
The order matters: Explain before Explore short-circuits inquiry and tells students the answer before they have reason to ask. Elaborate before Evaluate robs students of the chance to transfer before being judged. The 5E model operationalizes the principle that students build understanding by doing first, naming second, and applying third.
A sixth-grade teacher introduces particle models of matter before students have observed any mixing, melting, or dissolving phenomena. Which developmental concern is most likely to surface?
During a 5E lesson on stream erosion, a teacher introduces the term 'deposition' immediately after the Engage phase, before students have explored the stream table. Which principle does this most violate?