Another substantial undertaking by regulating authorities in most countries is the provision of an air traffic control service and the licensing of the air traffic control officers who operate the service.

'As I explained, this is quite a substantial undertaking.'

The three-episode-block was an "enormous challenge" and a "substantial undertaking", but MacFarlane said he would be willing to do it again if the ratings proved the event to be a success.

A business and personal move is a substantial undertaking, so avoid placing undue pressure on your team and yourself by committing realistic deadlines.

It therefore involves a substantial financial undertaking - although some practitioners offer reduced fee schemes.

"This is a pretty substantial undertaking even though it's a pretty puny reactor," he said.

The business was also involved with industrial design and construction of flour mills, water mills, coal mines and other substantial undertaking.

MacFarlane described the crossover event to be an "enormous challenge" and a "substantial undertaking"; he chose to do one central story line so that each writing staff would not have to write stories for unfamiliar characters.

That would be a substantial undertaking.

The establishment of a solid, balanced transatlantic relationship also depends on a substantial European undertaking in the field of defence, in line with the NATO framework.