In our own analysis of our problem, we feel the currency crisis is both the product of internal and external factors.

CNN: 'We Remain Confident'

Too many internal and external factors are involved for any company to implement their plan without some degree of change along the way.

FORBES: Strategy Ain't What it Used to Be

Both external and internal factors are making the UAE authorities nervous.

ECONOMIST: The United Arab Emirates

The policy changes are less a function of an internal evolution and more likely motivated by external factors.

FORBES: Obama and Romney: Energizing Their Bases by Muddying Coal and Wind

Unfortunately, the exogenous factors hitting the economy in the second quarter, both external and internal, are much worse than the first quarter, said Tony Volpon, head of emerging markets research at Nomura Securities in New York.

FORBES: Brazil's Star Power Dims, Economic Growth Weaker Than U.S.

Burnout is sometimes motivated by internal factors, Dr. Ballard says, and sometimes it really is a symptom of external ones.

FORBES: 10 Signs You're Burning Out -- And What To Do About It