The Department for Education and Skills said, in line with its commitment to offer greater degrees of parental choice, it was working with the Steiner group to explore "different, but effective, educational principles".

BBC: NEWS | UK | Education | Steiner school's academy bid

The experts they called in explained the basic principles of effective community policing.

NEWYORKER: The Hot Spotters

Kempel described six key principles of effective execution.

FORBES: Execution Machine: Doron Kempel's Six Keys To Getting Stuff Done

Once people learn about the social psychology of power, they can use these principles to become more effective in their interpersonal interactions.

WSJ: How to Succeed at Office Politics

And in our case, Colombia and other Latin American countries that believe in democracy and believe in freedom, we have the obligation to pursue those principles following the most effective path.

WHITEHOUSE: President Obama and President Santos Hold a Press Conference | The White House