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Usually it would be to.

to >preposition 1. expressing direction or position in relation to a particular location, point, or condition. . . . 3 identifying the person or thing affected. 4 identifying a particular relationship between one person or thing and another. . . . 6 indicating that two things are attached. . . .8 used to introduce the second element in a comparison. . . .

Example: He sure of his commitment to the project

However, if generalizing to plural and vague abstract ideas it could be okay to say on but even then to is usually a better choice.

Example:

He has demonstrated his commitment on any number of projects

He has demonstrated his commitment to any number of projects. (see number 5 below)

on >preposition 1 in contact with and supported by (a surface). 2 on to. 3 in the possession of. 4 forming a distinctive part of the surface of. 5 about; concerning. 6 as a member of (a committee, jury, etc.). 7 having (the thing mentioned) as a target, aim, or focus. 8 stored in or broadcast by. 9 in the course of or while traveling in. 10 indicating the day or time when something takes place. 11 engaged in. 12 regularly taking (a drug or medicine). 13 paid for by. 14 added to. >adverb 1 in contact with and supported by a surface. 2 (of clothing) being worn. 3 further forward; with continued movement or action. 4 taking place or being presented. 5 (of an electrical appliance or power supply) functioning. 6 on duty or on stage. >noun (also on side) Cricket the leg side.

-PHRASES be on about Brit. informal talk about tediously and at length. be on at Brit. informal nag or grumble at. be on to informal 1 be close to uncovering an illegal or undesirable activity engaged in by (someone). 2 (be on to something) have an idea that is likely to lead to an important discovery. on and on continually; at tedious length. on to moving to a location on the surface of or aboard.

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βˆ™ 16y ago
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βˆ™ 12y ago

It is grammatically correct, but still wrong. Use "make a commitment."

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Q: Is it gramatically correct to use 'commitment on' or 'commitment to'?
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