The phrase "articulate a reason" is correct and usable in written English.
You can use it when you want someone to express or explain their reasoning clearly and effectively.
Example: "In the meeting, I asked her to articulate a reason for her decision to change the project timeline."
Alternatives: "express a rationale" or "explain a justification."
In my judgment, the Court has yet to articulate a reason for not deciding this case.
"The only time they fired is when they can articulate a reason for jeopardy," Mr. Galantucci said in an interview this week.
All of which makes his effort to articulate a reason why voters should give him another four years -- other than the fact he is not Mr. Romney -- even more vital to his prospects.
Indeed, it is very difficult to articulate a reason why statements on the same subject matter as a witness' testimony should not be turned over to an adversary after the witness has testified.
"You tell the jurors that mercy is a perfectly appropriate reason to give a life sentence to someone; that they are never required to impose a death penalty; that they never even have to articulate a reason why they vote for life.
She can't articulate a reason because she has none.
The appeals court vacated the commission's order, instructing the F.C.C. to "articulate a reasoned basis for this change in policy".
Again, the intention is to push the burden back on the moral anti-realist to articulate a reasoned distinction between the objective moral facts, which are deemed problematic, and the other kinds of objective normative facts, which supposedly are not.
Expressing a desire to die, he has declined legal representation, and Mr. Ford, the corrections spokesman, said Mr. Arguelles had neither articulated a reason for his choice nor agreed to explain his outlook in any interviews.
For example, if the deadline you were given was already quite reasonable, you will want to articulate a good reason to ask for the extension.
The White House just needs to articulate a legitimate reason," he said.
