Skill Recharge

I'm having difficulty finding the answer to this question and so I thought I'd ask the fellow members of this forum...

What is the difference between an item that says, "Halves skill recharge (chance xx%)" and an item that says, "Improves skill recharge (chance xx%)"? I would assume that this also applies to the items with a similar effect on casting speed.

I suppose that the ultimate question is -- Just how much does "improves" mean?


Thank you all in advance...

Before a recent update: "Improves skill recharge (chance: xx%)"
After a recent update: "Halves skill recharge (chance: xx%)"

They just fixed the wording.