Rethinking Assessment in Science: Moving Beyond Tests

Assessment has always been more than a neutral measure of student achievement. In science classrooms, assessments shape what gets taught, how it gets taught, and how students see themselves as learners.

They signal what counts as important knowledge. They influence how classroom time is spent. And they affect which students come to believe they are “good at” science.

At their best, assessments illuminate student thinking, guide instruction, and provide meaningful feedback. At their worst, they reduce learning to lists of definitions and vocabulary, promote anxiety and frustration, and distort instruction to match the narrow constraints of a test.

Unfortunately, many current assessment practices fall into that second category.

In this post, I want to explore why that happens and introduce a possible solution: Phenomenon-Driven Tasks (PDTs)—a type of assessment designed to reveal how students actually think with scientific ideas.

The Problem with Many Current Science Assessments

Across the United States, there is growing dissatisfaction with how students are assessed in science.

Modern standards and research paint a clear picture of what science learning should look like. The Framework for K–12 Science Education calls for students to:

• develop models

• construct explanations

• reason with evidence

• investigate phenomena

• communicate scientific ideas clearly

This vision emphasizes sensemaking—students using scientific ideas and practices to explain how and why things happen in the natural world.

Yet assessment practices in many schools still focus primarily on memorization.

Students are often asked to recall definitions, identify vocabulary, or choose answers from a list rather than demonstrate how they reason through a scientific phenomenon.

This creates a persistent mismatch between what we say we value in science education and what we actually measure.

Why Current Assessment Practices are Frustrating

Teachers, students, and families often express frustration with current assessment systems for several reasons.

1. We measure what is easiest to test rather than what matters most. Multiple-choice exams are easy to score but rarely reveal how students are thinking about scientific ideas.

2. High-stakes testing influences instruction. When tests carry major consequences, instruction often narrows to match the format of the exam.

3. Grades become the focus instead of learning. Students often chase points rather than try to understand scientific ideas deeply.

4. Tests rarely reveal student thinking. Teachers may see whether an answer is correct but not why a student chose it.

5. The same assessments are expected to serve too many purposes. One test might be used for grading, accountability, and instructional decisions—even though each purpose requires different kinds of information.

Together, these issues highlight a simple truth:

We need assessments that reveal how students think about the world around them—not just what answers they produce.

A Different Approach: Phenomenon-Driven Tasks

One way to rethink assessment in science is through Phenomenon-Driven Tasks (PDTs).

A PDT is designed to capture the depth and complexity of student thinking as they use scientific ideas and practices to explain phenomena.

Rather than asking students to recall information, PDTs ask them to figure something out.

These tasks are grounded in actual phenomena and invite students to apply scientific ideas and practices to make sense of what they observe.

Well-designed PDTs are built to:

1. Elicit the integrated use of scientific ideas and practices

2. Make complex thinking visible through multiple prompts

3. Anchor tasks in real-world phenomena

4. Support multiple forms of analysis (formative, educative, or summative)

5. Promote equity and fairness through careful design

Each task includes at least two parts.

The first prompt typically asks students to choose, sort, or sequence statements, images, or data related to the phenomenon.

The second prompt asks students to explain their reasoning, often through writing, diagrams, or models.

This combination allows teachers to see both:

• what students know

• how they use that knowledge to explain a phenomenon

One of the most powerful aspects of Phenomenon-Driven Tasks is that they blur the line between instruction and assessment.

When implemented well, students do not experience PDTs as “tests.”

Instead, they experience them as opportunities to figure something out about the world.