Over 150 Ball Schools exist throughout Germany and the concept is even now expanding internationally.

These are but two examples of how the concept of studying abroad has expanded.

But in the 1988 campaign, the concept of economic nationalism has expanded to cover less hostile notions of "fair" and "managed" trade.

In the 1980s the concept of institutional development expanded even more.

The concept of organlegging has expanded beyond the Known Space settings.

The concept has expanded into a movement with around twenty similar schools established in northern Western Australia by the mid 1990s.

The gemach concept has expanded to include free loans of household items, clothing, books, equipment, services and advice.

The associate concept soon expanded to include the C-5 Galaxy.

The concept has expanded since then, and a number of definitions have emerged, often conflicting.

Since he began researching in the 1950s, this concept evolves and expands to include new research, methods, and procedures.