The strategy is intended to prevent extremist speakers or groups from coming to universities.

We want to tackle the barriers preventing under-represented groups from participating in political life.

"The way the deal was structured, it prevented other financial groups from coming in," he said.

That's a view which will not be good news for those trying to prevent groups sharing and publishing leaked material.

Although the Awá live in a protected area, this did not prevent armed groups from entering their territory.

The state budget is three months late, preventing school systems and nonprofit groups from doing modest planning.

But once the failure of their political negotiations forced the Aztecs to withdraw, nothing prevented other groups from making contact.

There is one issue that we particularly need to take to heart: we must prevent terrorist groups from recruiting within our own societies.

The first concerns the proposal that would prevent political groups being formed of Members from one country only.