Several significant events have contributed to the international development of the learning sciences.

However, during this 23-year period, three events contributed to a worsening of water quality within a given year.

Several recent events have contributed to a sense that the museum is in trouble.

The events contributed to his final fall from power in 1964.

Additional events in the early 1850s further contributed to his continued decline.

Many events have contributed to the development and continued growth of community colleges.

It is not possible to say with any certainty if these events contributed to her family's decision to leave Iraq.

Such events may both result from and contribute to global warming.

The events of 1948 contributed further to this search for cultural identity.

It would be a good experiment to see what events contribute to the changes.