Assessing the Story We Actually Built

Why I abandoned OpenSciEd's midpoint task, wrote an assessment around the injured foot instead, and eventually turned one open-response assessment into a ladder of increasingly supported versions.

In this chapter, you will see...

What stays protected

The injured-foot phenomenon • skin/muscle/bone/blood/nerves • structure and function • interacting systems • application rather than isolated recall • a clear picture of what students actually understand

What changes across versions

How much students must organize independently; how much language they must generate; whether success criteria are visible; whether the response is constructed, framed, selected, or digital; and how narrowly each item isolates a specific idea.

Lesson 7: Assessing the Story We Actually Built

Why the midpoint assessment became a complete departure from OpenSciEd—and how one assessment slowly became many.

By William Pirl | Unit 6.6: Injuries & Healing | PIRL Experimental

I am not sure I ever taught OpenSciEd Lesson 7.

That is unusual for this project. In most chapters, even when I substantially modify the published lesson, I can trace the rebuild back to something I tried in the original. Here, I noticed the mismatch before I ever felt much need to try it.

By the middle of an OpenSciEd unit, I generally already have a good sense of what students have been asked to figure out. What I want from a mid-unit assessment is a clean checkpoint: Can they now explain the phenomenon using the ideas we have built so far? Which connections are secure? Which ones only sounded secure during discussion?

The published task was asking a different question.

I did not need another activity that looked like assessment. I needed evidence I could use.

The assessment I wanted

I wanted students to return to the injured foot and explain it with the science they had accumulated: skin as a barrier, muscle and bone as a movement system, blood as transport and early wound response, nerves as communication, and the way damage to one part of the system can change the function of the whole.

What OpenSciEd is trying to build

OpenSciEd's Lesson 7 is a one-day 'Putting Pieces Together' lesson at the end of the first lesson set. Students plan an investigation to determine whether other things are made of cells, then analyze secondhand microscopic images of living or formerly living materials and things that were never living. They use those images as evidence to argue that all things are not made of cells and that parts of living things contain cells.

That is a defensible assessment of a developing NGSS performance. It asks students to plan an investigation, reason across scale, analyze microscopic evidence, and construct an argument. The Teacher Edition is also explicit that students are not yet expected to generalize that all living things are made of cells; that understanding continues to develop later in the unit.

My objection is not that the task is poorly designed. It is that it gives me different information from the information I most want at this point in my version of the unit.

A good assessment can still be the wrong assessment for the question I need answered.

The published midpoint is deliberately a transfer of the cell idea

The learning plan devotes the assessment to brainstorming what else might be made of cells, planning how to investigate that question, analyzing provided microscopic images, and then discussing the conclusion. The task is formative, but its center of gravity is MS-LS1-1 and reasoning from microscopic evidence.

I went in a different direction almost immediately. Instead of leaving the unit phenomenon to test a broader cell claim, I used the midpoint to return to the phenomenon.

Modification #1: Put the injured foot back at the center

The original assessment I wrote begins with the same kind of evidence students encountered at the start of the unit: injury description, examination findings, X-rays, diagnosis, pre- and post-surgical images, and the loss of feeling in part of the foot.

The phenomenon is not decoration around the test. It is the organizing structure of the test.

The original assessment follows the storyline students actually experienced

The open-response version is demanding. It does not simply ask for definitions. Each section takes a piece of evidence from the case and asks students to explain it using the systems they have studied.

That structure gives me the information I want. If a student struggles, I can see whether the problem is a specific content idea, connecting multiple systems, using evidence from the phenomenon, or constructing the explanation itself.

Modification #2: Keep the explanation, expose the success criteria

The next important version does not fundamentally change the product. Students are still expected to explain the phenomenon in writing. What changes is that the hidden architecture of a successful answer becomes visible.

Instead of a blank response space beneath a large prompt, the GE version adds a checklist. For the skin question, students can see that they need to describe structure, explain function, explain how a cut affects the larger system, and demonstrate the relationship among structure, function, and systems.

The checklist does not tell students what to think. It tells them what their thinking needs to accomplish.

This is one of my favorite assessment modifications because it can substantially increase access without changing the central product. A student still has to generate the explanation. The checklist simply reduces the amount of task analysis that has to happen invisibly before the science ever reaches the page.

Modification #3: Preserve the phenomenon, scaffold the reasoning path

The ALT version moves farther. The original phenomenon and big prompts remain, but the response space is no longer empty. Students receive sentence-frame-style prompts that break the explanation into smaller causal steps.

For the nerve section, for example, the student is guided through nerve-cell structure, nerve-cell function, what loss of feeling implies, and what tingling might suggest about returning function. For movement, the frame walks students through the systems involved, signaling, muscle-bone interaction, and the consequence of damage.

The versions are not interchangeable—and that is fine

An open response, a checklist-supported response, and a sentence-frame response do not provide identical evidence. I do not need them to. I need to understand what each version reveals and choose the version that creates an appropriate challenge for the student.

Modification #4: Let technology create a different kind of diagnostic

The Google Forms versions move the assessment farther from the original essay-style product. Much of the content is separated into multiple-choice questions about skin, blood components, nerves, movement, and healing. Some versions retain a larger open response at the end; others are reduced almost entirely to selected response.

This changes the assessment substantially—but it also gives me something useful. I can quickly isolate whether a student knows the function of platelets, understands why low red blood cells could slow healing, recognizes the consequence of nerve damage, or can connect muscle and bone to movement.

Sometimes I need a performance. Sometimes I need a diagnosis.

A selected-response version is weaker evidence that a student can construct a systems explanation independently. It can be stronger evidence about exactly which prerequisite ideas are secure and which are not.

The assessment became a ladder rather than a track

Once several versions exist, the most useful feature is not that I can permanently assign students to 'high,' 'medium,' and 'low' tests. It is that I can move the support.

A student might begin with the checklist version and show that the structure is unnecessary. The next assessment can remove it. Another student may understand the science in discussion but collapse when asked to organize five ideas in an open response; sentence frames can help determine whether the barrier is the science or the product.

OpenSciEd vs. my rebuilt Lesson 7

What I am protecting, compressing, and still questioning

The version I want to use this year

I do not think there should be one default version for every student. The assessment itself is now mature enough that the more important decision is matching the student to the right starting point and then allowing the evidence to move that student.

A possible 66-minute Lesson 7

The bigger point

Writing my own Lesson 7 assessment was one of the first times in this unit that I stopped asking how faithfully I could implement OpenSciEd and instead asked what evidence I actually needed from students.

That decision eventually created something more valuable than a replacement test. It created an assessment system. The phenomenon stays recognizable, but the amount of independence can move. A student can be challenged, supported, reassessed, or moved to a different version without pretending that every assessment format produces the same evidence.

The assessment is not the destination. It is a tool for locating the student.

Sources & design notes

Primary curriculum source: OpenSciEd, Unit 6.6, Lesson 7 Teacher Edition, “Are all things made of cells?” Version dated 2/9/22. OpenSciEd uses the lesson as a one-day putting-the-pieces-together midpoint assessment focused on investigation planning, microscopic evidence, and a developing claim about cells in living and nonliving materials.

Assessment examples: AT Mid-unit assessment (original open-response version); GE Mid-unit assessment (checklist/success-criteria version); ALT Mid-unit assessment (sentence-frame version); and multiple Google Forms adaptations that shift portions of the assessment to selected response, data interpretation, and shorter constructed response.

LESSON 7 | CONDENSED MODIFICATION GUIDE

Unit 6.6 • Injuries & Healing

PROTECT: phenomenon • application • structure/function • systems interaction • skin/muscle/bone/blood/nerves • diagnostic usefulness

RECOMMENDED TIMING

CUT FIRST: assessment tasks that do not answer the question you need answered • unnecessary writing load • hidden success criteria • redundant items • modifications that make the result harder to interpret.

Teacher-created replacement for OpenSciEd Unit 6.6, Lesson 7

Lesson 7: Practical Modification Guide

Phenomenon-Based Assessment & Differentiation

What this lesson really needs to accomplish

The midpoint assessment should tell me what students can explain now—not merely generate a grade.

• Students apply ideas to the injured-foot case.
• Students connect structure and function.
• Students reason about interacting systems rather than isolated body parts.
• Students explain the roles of blood components in early healing.
• Students connect nerve damage to loss or return of sensation.
• Students connect nerves, muscles, and bones to movement.
• The assessment format is accessible enough that the result tells me something useful.

What I have done in the past

1. Replace the OpenSciEd midpoint task

Rather than assess whether other materials are made of cells, I wrote a new assessment around the unit phenomenon and the body systems students had already studied.

2. Start with a demanding open-response version

The original AT version asks students to independently select and organize the science needed to explain five parts of the injury and early healing.

3. Add a checklist version

The GE version keeps the same basic constructed-response product while making the required components visible.

4. Add a sentence-frame version

The ALT version breaks each explanation into smaller causal steps so students can demonstrate understanding with less planning and language generation.

What I am using / refining now

1. Google Forms hybrid assessment

Use selected-response items to isolate key content, include application questions and data interpretation, and preserve at least one constructed response when independent integration is important.

2. Heavily modified digital version

Use direct language, accessible answer choices, and reduced writing when the goal is to determine whether essential science ideas are present at all.

3. Fluid assessment placement

Do not lock a student into one level. Move scaffolds up or down based on performance, classroom evidence, and the demands of the next assessment.

4. Reassessment with a nearby version

If a student fails because the original product obscured what they know, reassess with a more supported version. If the student succeeds easily, reduce support next time.

My current recommendation

Keep the phenomenon constant across as many versions as practical. Build the support ladder around the same science story so that differences in performance are easier to interpret. Use the open/checklist versions when explanation is part of the construct; use sentence frames and selected response when the immediate question is whether the underlying science is present.

What to cut first

• Unrelated midpoint tasks that do not provide the information you need.
• Writing demands that are not part of the target.
• One enormous prompt when smaller sections produce clearer evidence.
• Redundant questions that assess the same relationship repeatedly.
• Answer choices that create language traps rather than science evidence.
• Reassessment that simply repeats the same inaccessible format.

What not to cut

• The injured-foot phenomenon.
• Application of science rather than pure vocabulary recall.
• Skin, muscle, bone, blood, and nerves.
• Structure-function reasoning.
• Interacting systems.
• A meaningful healing connection.
• Enough challenge to distinguish recognition from explanation.

One rule for a teacher new to the curriculum

Do not modify the test until you can say exactly what you want the test to tell you.