Improper payments include inadvertent mistakes as well as outright fraud and abuse.

Mr. Livingston's statement was an inadvertent mistake at best or an intentional lie at worst.

Reasons for the improper payments include inadvertent mistakes, outright fraud and abuse.

His gripe is not about people who make inadvertent mistakes or even exaggerate a bit.

"As far as I'm concerned, he made an honest, inadvertent mistake."

These improper payments could range from inadvertent mistakes to outright fraud and abuse.

I'd last three steps inside the gardens and make another inadvertent mistake.

He was supported by the Prime Minister, who referred to the incident as an inadvertent mistake.

Others reflect billing errors and other inadvertent mistakes.

"I had made an inadvertent mistake, but a mistake in any event," he said.