May quotes Yahoo CEO Marissa Mayer who also believes in the power of constraint to make products and messages stronger.

FORBES: Constraints Are The Key To A Creative Presentation

The biggest constraint on Ms Rousseff's power may come from within.

ECONOMIST: Brazil's next government

For this client, the inflexibility of labor laws and the power of labor unions is a far bigger constraint to her IT agility than is the complexity of IT systems or internal processes.

FORBES: How A Few CIOs Use The Crummy Economy And A Bit of Data To Accelerate IT Strategy