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Prepositions after verbs

Design for vs design by

Design for usually means creating something for a purpose or user. Design by is less common after the verb and usually introduces the designer or method.

Quick answer

Which form is correct?

Use design for when talking about purpose, users, or conditions. Use design by mainly when by introduces the person or process connected with the design, not as a fixed verb pattern.

The app was designed for children.
These shoes are designed for long-distance running.
The museum was designed by a local architect.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
design for + purpose/user

Showing intended use

Use design for to explain who or what something is intended for.

This chair is designed for office work.
The course was designed for beginners.
2
design by + person

Naming the designer

Use by to identify the creator after a passive form of design.

The bridge was designed by a Japanese engineer.
The logo was designed by our marketing team.
3
design + object

Using design without a preposition

Design can take a direct object when you mention the thing being created.

She designed the website last year.
They designed a new battery for electric cars.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
design for
The software was designed for small businesses.
Intended purpose or target user.
design by
The theatre was designed by a famous architect.
Introduces the creator in a passive sentence.
design with
They designed the tool with safety features.
Adds features or materials, not the main verb pattern.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using design by for purpose

Use design for when talking about intended use.

✕ This device is designed by students. ✓ This device is designed for students.

Forgetting the passive with by

By usually follows a passive form such as was designed by.

✕ They designed by a consultant the office. ✓ The office was designed by a consultant.

Quick practice

Choose the expression that matches the intended meaning.

1. The program was designed ___ new employees.
2. The tower was designed ___ a French architect.
3. They designed the product ___ easier home use.

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Frequently asked questions

Is design for the most common pattern?

Yes. Design for is the standard way to express purpose or intended users.

Can I say designed by someone?

Yes. Designed by is natural in passive sentences when naming the creator.

Is design by a fixed verb-preposition combination?

Not usually. In most cases, by simply introduces the agent after a passive verb.

dabble, in, dabble, with "damage to" or "damage by"? dance to, with, on, in or for? "dangle from" or "dangle in"? dare to, for, on, as or at? dash to, into, out, from or on? daydream about, for, in, of or on? "debate in", "debate on" or "debate with"? deceive by, in, into, on or about? "decide on", "decide to" or "decide by"? declare in, by, on, to or as? decline in, by, from, to or for?

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