Engineering Design · California Grade 6-8

MS-ETS1-1

Define the criteria and constraints of a design problem with sufficient precision to ensure a successful solution, taking into account relevant scientific principles and potential impacts on people and the natural environment that may limit possible solutions.

Source: California Department of Education, NGSS Preferred Integrated Course Model, Grade 6-8 (accessed 2026-10-18)

Chapters

The lesson's engineering spread tells how Rohrer and Binnig stated what their microscope had to do and what limited them. Lab 3 and Worksheet 9 require students to write their own criteria and constraints for a probe-based mapping tool, with measurable precision, before designing, which is direct evidence toward this PE.

In W9 students convert a Science Night committee's brief into criteria with numbers or tests and constraints with limits, including a safety limit for young visitors. This is practice toward the PE; impacts on people and the environment are only touched on.

Before scoring feedstocks in Lab 3, students write the criteria and constraints in measurable terms and sort which is which. This is a step toward defining a design problem precisely, but the problem itself is given to them, so the role is practice. W9 Part A goes further: students rewrite a council brief as measurable criteria and constraints and add an impact-based constraint of their own, which W9 treats as evidence toward the PE.

Lab 3 opens with each group writing measurable criteria (mass change, sealing time, cost) and the constraints (materials, amounts, no rigid sealed containers) before any trap is built; the precision of those criteria is what makes the later data comparison possible. Listed for grades 6-8 in the California sequence; it is practiced here, not assessed.

W9 has students turn a school nurse's letter into six precise criteria and constraints, computing the per-pack cost limit and naming the rules that protect runners and the playing field. Lab 2 supports it by having teams restate a supplied brief in their own words and say how each item will be tested.

The plastics engineering spread shows criteria being revised after a solution caused a new problem. Lab 3 and W9 have students write criteria and constraints for a container or bag before designing, including an end-of-life requirement; the problems are classroom-sized, so this builds toward the PE rather than fully assessing it.

The lesson's engineering spread on the research drill ship gives students a real case for telling requirements (criteria) from limits (constraints). The presentation (for a seafloor-sampling tool) and W9 (for a drilling voyage) have students sort and write both; this practices the PE rather than fully assessing it because the design problem is given to students rather than defined from scratch.

The textbook's engineering spread shows conservation scientists stating what a wolf-tracking tool must do and what limits it. In Lab 3 students write their own measurable criteria and constraints for a shield that protects a frog-call sensor from highway noise, including effects on the animals being monitored, before they build anything.

The lesson's engineering spread shows how criteria and constraints shaped two different wetland-rebuilding designs in Louisiana. Students identify criteria and constraints in the W9 transfer task and the slide 25 discussion, but they do not define a full design problem with precision, so the role is practice rather than assesses.

Lab 3 gives students a design brief and asks them to restate its criteria and constraints as measurable targets (percent of ice lost, budget, size, access time) and to name the scientific principle each design choice relies on. The criteria are supplied rather than developed by students, so the role is practice.

In Lab 2 students turn a performance-target table into measurable criteria (load stays on the deck, sag limits, joints intact at each shaking level) and constraints (budget, materials, build time) before building, and Lab 3 adds site hazards as scientific limits on the solution. The problem frame is supplied by the teacher, so this practices the PE rather than fully assessing it.

The lesson's New York City case shows how precise criteria and constraints shaped a water-supply solution. Students sort criteria from constraints (slide 24), work to stated criteria in Lab 2, and choose criterion weights in Lab 3. The criteria are mostly supplied, so this is practice.

In W9 students turn a water board's vague goals into measurable criteria and firm constraints, then judge whether a criterion is strict enough for an invasion that can never be undone and write a stricter one; that is direct evidence toward the PE. Lab 2 (sharpening supplied net criteria and adding one of their own), W2, W3 and W10 item 7 practice the same skill.

Worksheets (28)

ChapterWorksheetRoleHow it connects
Ch. 1W2 · Atom, Element, Table: Words That Fit Together
Vocabulary in action
practiceStudents practice telling criteria from constraints in short engineering situations, the first step toward defining them with precision.
Ch. 1W9 · Design Challenge: A Hallway Model of the Atomic Scale
Transfer and design
assessesStudents write criteria and constraints with numbers attached, take scientific principles (scale ratios) and impacts on people (young visitors, accessibility) into account, and show how those definitions limit the possible designs. This is the PE as written.
Ch. 1W10 · Atoms and Elements: Mastery Check
Retrieval and mastery check
practiceTwo items ask students to distinguish and write criteria and constraints, a retrieval check on the defining skill of the PE rather than a full design task.
Ch. 2W9 · Design Brief: A Touchable Salt-Crystal Model for Science Night
Transfer and design
practiceStudents turn a committee's wishes into criteria and constraints with numbers or tests, including a limit set by what visitors can safely handle.
Ch. 4W9 · Fuel for the Island Ferry: Choosing a Biomass Source
Transfer and design
assessesStudents must write the criteria and constraints of the ferry-fuel problem with numbers or tests, taking into account the island's land, food crops and budget, which is the precision this PE asks for.
Ch. 7W9 · Where Should the Trees Go? Judging Three Carbon-Capture Plans
Transfer and design
practiceStudents must restate the county's goals as testable criteria and identify which limits are constraints, including impacts on the people who farm one of the sites.
Ch. 7W10 · Global Cycles of Matter: Mastery Check
Retrieval and mastery check
practiceOne item asks students to sort statements from a reforestation brief into criteria and constraints, a quick check of the precision idea in this PE.
Ch. 9W9 · Design a Hallway Timeline That Tells the Truth About Time
Transfer and design
practiceStudents must state the criteria and constraints precisely enough to test a design (for example, 'no two labels closer than 3 cm'), and they discover that two criteria conflict, which is the heart of defining a design problem well.
Ch. 10W9 · Design Challenge: A Sealed Mini-World That Survives Twenty-One Days
Transfer and design
practicePart A asks for criteria and constraints stated precisely enough to test, taking the science (energy entering a sealed tub, decomposers using oxygen) and the welfare of the living things into account.
Ch. 11W9 · Where Should the Overlook Go? Siting a Deck on a Changing Coast
Transfer and design
practiceStudents restate the brief's criteria and constraints with numbers before scoring; the brief supplies most of the limits, so this is practice in precise definition rather than a full definition task.
Ch. 14W9 · A Cold Pack for the Cross-Country Kit: Define, Evaluate, Modify
Transfer and design
assessesStudents read a school nurse's letter and write the criteria and constraints themselves, each with a number, including a safety limit that protects people and a no-toxic-leak rule that considers people and the environment. That is the PE's task of defining a design problem with precision.
Ch. 15W9 · The Sixty-Thousand-Fork Problem: Choosing a Material for the Cafeteria
Transfer and design
practiceStudents turn a district memo into precise, testable criteria and constraints, including effects on the environment (where each fork goes after use) and on people (lunch pace, staff time, budget). The problem is school-sized, so this builds toward the PE rather than fully assessing it.
Ch. 15W10 · Chemical Engineering and Society: Mastery Check
Retrieval and mastery check
practiceTwo items check that students can tell criteria from constraints and explain why engineers revised the criteria for plastics, which supports the problem-defining practice of this PE.
Ch. 16W9 · Plan the Drilling Voyage: Six Holes to Test a Spreading Ridge
Transfer and design
practiceStudents separate the requirements of a drilling plan (criteria) from its limits (constraints) and write their own, using real limits such as ship time, water depth and ship speed. The problem is given to them rather than defined from scratch, so this practices rather than fully assesses the PE.
Ch. 16W10 · Mastery Check: Evidence, Plates and Rates
Retrieval and mastery check
practiceOne item checks that students can tell a criterion from a constraint in the drill-ship design problem from this lesson.
Ch. 19W9 · Power for Cinder Ridge: Choosing an Energy Source With Criteria and Constraints
Transfer and design
practicePart A asks students to turn the town's wishes into measurable criteria and constraints, including environmental limits, before any option is judged.
Ch. 21W9 · Listening Past the Highway: Choose a Shield for the Frog Recorders
Transfer and design
practiceStudents sharpen a team's vague goals into measurable criteria and constraints and add one that protects people or the natural environment, using the scientific facts about sound that limit possible solutions. The team's final list is then supplied, so this is practice toward the PE rather than a full assessment of it.
Ch. 21W10 · Interactions Among Organisms: Mastery Check
Retrieval and mastery check
practiceTwo items check that students can tell what a design must do from what limits it, and can rewrite a vague criterion so it can be tested, including a constraint that protects the animals being studied. This retrieves the practice from Lab 3 and W9 rather than assessing the full PE.
Ch. 22W9 · Bringing Back Arroyo Verde: Design a Creek Restoration
Transfer and design
practiceStudents sort the council's goals into criteria and constraints, find a vague goal and rewrite it as something measurable, and connect each constraint to a real limit such as flood safety, budget and the bird-nesting season. The problem is already partly defined for them, so the role is practice.
Ch. 22W10 · Changing Ecosystems: Mastery Check
Retrieval and mastery check
practiceItem 11 checks that students can tell a criterion from a constraint and connect a design choice to a local constraint, as in the lesson's wetland-rebuilding spread.
Ch. 25W9 · Listening to Silver Basin: Design a Volcano Monitoring and Alert Plan
Transfer and design
practiceStudents rewrite a county's vague goals as measurable criteria and list the constraints, using the science of precursors (for example, that locating a quake needs at least four stations). The problem frame is supplied, so this practices rather than fully assesses the PE.
Ch. 27W9 · Design Challenge: Salt Ponds or Marsh? Planning a Bay Shoreline
Transfer and design
supportsPart A asks students to sort the problem's requirements into criteria and constraints and to say whether each constraint is scientific, economic or social.
Ch. 28W2 · Four Kinds of Help: Sorting the Services Ecosystems Provide
Vocabulary in action
supportsTwo items ask students to tell a criterion from a constraint in a short design rule, the distinction they will use when defining and judging solutions later in the chapter.
Ch. 28W9 · Owls or Poison? Designing Rodent Control for a California Vineyard
Transfer and design
practiceq3 asks students to rewrite a vague criterion ('fewer pests') precisely enough to measure; most criteria are supplied, so this is practice.
Ch. 29W2 · Six Pressures and the Words Engineers Use
Vocabulary in action
practicePart C has students sort statements about a real design problem into criteria, constraints and tradeoffs and justify each choice, which practices defining a design problem precisely.
Ch. 29W3 · Nets That Let the Right Animals Go
Reading with evidence
practiceStudents identify the criteria and constraints each design had to meet, including impacts on the people who use the nets, which practices defining a design problem precisely.
Ch. 29W9 · Keep the Mussels Out: Designing a Boat Check for a Reservoir
Transfer and design
assessesPart A asks students to turn the board's vague goals into measurable criteria and firm constraints, and Part D asks them to judge whether a criterion is precise enough given how invasions start, which is the precision the PE describes.
Ch. 29W10 · Checkpoint: People, Populations and Protecting Ecosystems
Retrieval and mastery check
practiceItem 7 checks that students can tell a criterion from a constraint in a new design problem.

Labs (12)

ChapterLabRoleHow it connects
Ch. 1Lab 3 · Design a Touch Microscope: Map a Surface You Cannot See
Engineering design challenge
assessesStudents write their own criteria (with numbers) and constraints before designing, then use them to evaluate their map; the written definitions and the evaluation against them are direct evidence for this performance expectation.
Ch. 4Lab 3 · Fuel for Flight: Which Biomass Should Become Jet Fuel?
Data-driven decision
practiceStudents sort the airline's requirements into criteria and constraints and rewrite each as something measurable, which builds the defining practice; the problem itself is supplied, so this is practice rather than assessment of the PE.
Ch. 13Lab 3 · Trap Every Gram: Design a Gas Catcher for a Fair Mass Test
Engineering design challenge
practiceThe first step of the lab is writing criteria with a measurement and a target (mass change, sealing time, cost) and the constraints (materials, amounts, no rigid sealed containers). Students practice the precision this PE asks for, but the problem is given to them, so it is practice rather than assessment.
Ch. 14Lab 2 · Build a Better Pack: Design, Test and Improve a Hot or Cold Pack
Engineering design challenge
supportsStudents restate the brief's criteria and constraints in their own words and write how each will be tested, which supports the PE without asking them to define a problem from scratch.
Ch. 15Lab 3 · Design a Produce Bag: Criteria First, Then Build and Revise
Engineering design challenge
practiceStudents write their own criteria with numbers and tests, including an end-of-life requirement tied to the school's real facilities, and list constraints (token budget, menu, time), then use them to judge their own bag; the problem is classroom-sized, so this builds toward the PE rather than fully assessing it.
Ch. 16Lab 3 · Where Should the Drill Ship Go? Spend the Budget to Test Spreading
Data-driven decision
practiceChoosing drilling sites under a budget requires students to state what a good site must do (criteria) and what limits the plan (constraints), the same reasoning the lesson's drill ship story describes. The problem is given rather than defined from scratch, so this practices rather than assesses the PE.
Ch. 21Lab 3 · Shield the Frog Listener: A Noise Barrier for a Pond Sensor
Engineering design challenge
practiceStudents rewrite seven plain-language needs as measurable criteria and constraints with numbers, units and tests (q1), including constraints that protect the pond and allow the sensor to be serviced, before building. It is practice rather than assessment because the class then adopts shared test rules so results can be compared.
Ch. 24Lab 3 · Save the Ice Cube: Design, Test and Improve an Insulated Holder
Engineering design challenge
practiceStudents turn the brief into measurable targets (q1) and consider how a waste constraint would change the winning design (q11). The criteria are supplied, so this is practice rather than full evidence for the PE.
Ch. 25Lab 2 · Shake Table Bridge Challenge: Define, Build, Shake, Improve
Engineering design challenge
practiceThe design brief requires every criterion to be measurable (load stays on the deck, sag change in millimeters, joints intact, rating at each shaking level) and every constraint to be stated (budget, materials, time, no supports in the river). The problem frame and the targets are supplied, so students practice rather than fully define the problem.
Ch. 25Lab 3 · Three Crossings, One Bridge: Rank the Sites by Hazard Risk
Data-driven decision
practiceThe lifeline criterion comes from what people need after an earthquake, and each site's hazards limit which designs can succeed and what they cost. The criteria are supplied, so students practice applying them rather than defining them from scratch.
Ch. 28Lab 3 · The Council Packet: Protect the Ecosystem or Pay to Replace It?
Data-driven decision
practiceStudents identify the budget and stakeholder limits as constraints and, in q8, turn the goal of keeping a service into a measurable monitoring criterion with a trigger for action. Most criteria are supplied, so this is practice.
Ch. 29Lab 2 · Spare the Snail-Eaters: Design a Net That Lets By-Catch Escape
Engineering design challenge
practiceStudents start from supplied criteria (keep the large fish, release the small fish) and constraints (string budget, build time, durability), add one measurable criterion or constraint of their own, and use measured fish sizes to define the opening range a solution must hit. Because the core criteria are supplied, this is practice toward the PE.