The RB211's complexity required a lengthy development and testing period.

Such complexity requires players to manage a larger amount of information than other strategy games.

"Even the complexity of blending requires a pretty serious computer and software."

But there comes a time when the complexity and importance of the tasks at hand require me to be someplace else.

Also, the complexities of the issues require time in order to produce an unassailable verdict.

The complexity of these systems require extensive programming and maintenance, further extending the cost.

Generally, the complexity of these tools requires specialist capabilities and specific knowledge.

Civil society is a necessity, and the growing complexity of society requires it.

The complexity of these issues requires a comprehensive political, humanitarian, economic and social solution.

In these situations, the complexity of the heart failure requires a specialist's knowledge and attention.