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ACT® · Science: The Three Passage Formats

Engineering and Design Passages, New to the Blueprint

Engineering and design passages test the same reasoning as experiment passages, but trade a hypothesis for a goal and always name a problem, its constraints, and a tradeoff between designs.

The science test is built around experiments, but real science work often means building something instead of testing a hypothesis about nature. So the test added passages where a team is solving a problem with a device, process, or structure. These still fit inside the same three passage formats you already know. Nothing about how you read graphs or compare setups changes.

An engineering passage always names three things. First, the problem: what needs to get built or fixed. Second, the constraints: the limits any working design has to satisfy, like a cost cap, a size limit, or a minimum performance level. Third, the tradeoff: when two or more candidate designs are compared, each wins on some constraints and loses on others. Reading the passage means tracking which design wins which tradeoff, not picking an overall favorite.

The word swap from hypothesis to goal doesn't change the logic underneath. A hypothesis says what result would count as support; a goal says what outcome would count as success. You still check whether the data, trial, or test run delivered that outcome. This also means an engineering flavor can sit on top of any of the three formats. A Research Summaries passage about bacteria in bioreactors can carry a secondary engineering and design code while staying Research Summaries: the format and its reading strategy don't change, you just also track design reasoning alongside the biology.

Key terms

Constraint
A limit a design must satisfy to count as workable, such as a cost cap or minimum performance level.
Tradeoff
The way one design beats another on some constraints while losing on others.
Goal
The stated outcome a design must achieve, playing the same role a hypothesis plays in an experiment passage.
Secondary code
A second reasoning label layered onto a passage's main format, without changing which of the three formats it is.

Watch it explained

  1. How it worksHow does an engineering passage swap the word hypothesis for the word goal without changing the reasoning?
  2. How it worksWalk me through the three things an engineering passage always names: the problem, the constraints, the tradeoff.
  3. Going furtherWhat changes about a science passage once it carries a secondary engineering and design code on top of biology?

Check yourself

Your turnmedium1 of 3
A passage describes a team building a portable water filter that must remove at least 96 percent of a contaminant, cost under 46 dollars a unit, and be carried by one person. Two candidate designs are compared. Which three things does the passage name?

End of topic.