Sign In Get Started
Preposition after adjective

Effective in, at, or for?

Use effective in for areas or processes, effective at for activities or skills, and effective for for purposes or users.

Quick answer

How do you use effective with prepositions?

Effective in refers to effectiveness within an activity or process. Effective at refers to skill in doing something. Effective for refers to suitability or usefulness for a purpose or group.

The drug is effective in treating infections.
She is effective at managing teams.
This tool is effective for small businesses.

Choose the pattern by meaning

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

1
effective in + activity/process

Describing success within a process

Use in when referring to an area, system, or process where something works well.

The policy was effective in reducing waste.
2
effective at + skill/task

Describing ability in doing something

Use at for someone's skill or performance in an activity.

He is effective at solving conflicts.
3
effective for + purpose/group

Describing suitability

Use for when something works well for a goal, condition, or group of people.

The treatment is effective for chronic pain.

See the difference in context

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

Construction
Example
Meaning
effective in
The campaign was effective in raising awareness.
successful within a process or activity
effective at
She is effective at negotiation.
skilled at doing something
effective for
This app is effective for beginners.
suitable or useful for a purpose or group

Common mistakes

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

Using at with processes

Use in for broader processes and systems.

✕ The law was effective at reducing crime. ✓ The law was effective in reducing crime.

Using for with personal skills

Use at for someone's ability.

✕ He is effective for leading meetings. ✓ He is effective at leading meetings.

Quick practice

Choose the expression that matches the intended meaning.

1. The medicine is effective ___ treating migraines.
2. She is effective ___ motivating staff.
3. This method is effective ___ young learners.

Check your sentence in context

Paste the complete sentence below. Linguix checks the preposition together with grammar, spelling, punctuation, and style.

Free to try · No signup required

Frequently asked questions

Can effective at and effective in both be correct?

Sometimes. Effective at usually focuses on skill, while effective in focuses on results within a situation or process.

Is effective for people or purposes?

Both. You can say effective for children or effective for reducing costs.

Can I say effective to?

Effective to is uncommon after the adjective. Effective for is usually the natural choice.

eager-for-to-in-about, on "early in", "early on" or "early for"? earnest in, with, on, for or at? easy for, on, in, to or with? "economical with" or "economical in"? "ecstatic about" or "ecstatic with"? "efficient in" or "efficient at"? elderly in, with, at, of or as? elegant in, with, of, as or to? eligible for, to, in or under? "embarrassed by" or "embarrassed about"? "embarrassing for" or "embarrassing to"?

Write with confidence in Linguix

Create a free account to check complete texts, apply suggestions, and save your documents.

Create a free account