The system was determining what movements were necessary to stay upright.
The extent of their expertise was determining whether skin was oily, dry or sensitive.
"The biggest challenge was determining the right ratio of authenticity and playability," Astolfi said.
So was determining the precise balance between comedy and pathos in a piece that Mr. Engler described as Chekovian.
Among the difficulties, he said, was determining the exact amount of the payments.
That certainly did not help their cause when Goodell was determining Payton's fate.
Crucial to the decision was determining how long it would take to turn a profit.
Paul Dacre, the editor-in-chief of London's formidable Daily Mail, wrote that the secret of editorship was determining when to be cautious and when to be bold.
A Facebook spokesman said on Thursday that the company was determining where the search box would go and how to make it work best for users.
In 1964, he moved to Washington to work in the E Ring of Robert McNamara's Pentagon, just at the moment when it was determining Vietnam War policy.
He said one challenge was determining when the threat of terrorism in the country was greatest, a task that now falls to the attorney general.
