This is the boom being managed by local people certain they know how to look after their interests and safeguard the land they live on.
As a "rock star" I have a role to play in a story I have helped to write, but I'm really not certain I know how to do it.
We have plenty of people - politicians and others - who are certain they know how to solve our problems.
I'm certain they know how to proceed when a ship looses power and must rely on emergency generators, which happened aboard Costa Concordia.
Major changes (such as installing window screens) should be performed be a professional unless you're absolutely certain you know how to do it yourself.
You cannot beat them with divine mastery of control, you just gotta use psychology in a certain way and know how to protect yourself in a certain way.
"If you are a prudent insurer you want to make certain that you know how much risk you are exposed to at a certain location," said Nick Brett, underwriting director at AXA Art Insurance, the world's biggest specialist art insurer.
We are certain the boys know how lucky they were to have you as their father.
If cancer is found, there is no certain way to know how deadly it is, or if it will ever be deadly, although scientists are now searching for markers to indicate how aggressive a prostate cancer may be.
The only certain way to know how this exposure will affect the health of workers is through long-term epidemiological studies.
It's important for people to know where to find certain items, to know how to ask for help and where to go, and to know how to pay for the items at checkout upon completion of the purchases, including using a self checkout.
