The prudent owner must keep a constant eye on wastefulness.
NGOs keep a constant watch on big firms.
"It's very different to traditional media: you keep a constant conversation.
You can, however, keep a constant supply of productive plants by taking offsets from a good parent.
Six big fans keep a constant breeze going, making sure that the whole room is the same temperature.
Aircraft could be wired to allow workers on the ground to keep a constant watch on their health.
SHIPS navigating the lawless seas of the Gulf of Aden must keep a constant lookout for Somali pirates.
In order to compete in the global airline industry you need to adapt to changes and keep a constant focus on cost.
Ray, who was the commodore of his club, P.S.S.A. (Pacific Singlehanded Sailing Association), admits that technically, solo sailing is illegal because you cannot keep a constant watch.
The political mood is "not geared up to eradicate [fuel poverty]", he says, "but rather to keep a constant pressure to drive it down".
"I must admit that even though I am his personal physician, there's no way I can keep a constant check on him," he said.
