The phrase "the modalities of" is correct and usable in written English.
You can use it to refer to the ways or methods by which something is done. For example: "The modalities of international trade are highly complex and constantly evolving."
The modalities of withdrawal need obvious attention.
'It's not about peace or war, but the modalities of making peace.
The Oslo "peace process", begun in 1993, changed the modalities of the occupation, but not the basic concept.
His compositions expanded, embracing the modalities of raga along with dissonances not found in country or blues; he used unconventional tunings and turned some traditional picking patterns backward.
"We are still -- negotiating is the wrong word -- we are still working with the Yemenis very closely on the modalities of how you do this," Ms. Bodine said.
Rio+20 agreed that a group of at least 30 countries will agree the modalities of future consultation on the new goals.
The only new element, after all, is the aim of beginning discussion of the modalities of a cessation of hostilities within a week.
Russian news agencies reported on Thursday that a deputy foreign minister, Gennady Gatilov, had said Moscow was "ready to discuss the modalities of a ceasefire" at the Munich security conference from 12-14 February.
Where we used to get our way, increasingly, even poor countries are saying "No thanks" when they do not like the modalities of aid or trade relationships, or the conditions we attach to them.
The IMF confirmed receipt of the request, saying that it will next discuss with Greek and EU authorities "the timing and the modalities" of talks on the next bailout.
What the government is actually planning is an experiment to change the modalities of existing transfers — nothing more, nothing less".
