Only proposals of the highest quality were accepted.
On the whole, about one thousand proposals were accepted (each one consisting on average of 50 observations). Over 500 principal investigators have made observations with ISO.
Who developed ISO?
The scientific instruments were developed by multinational teams, with leaders in France, Germany, the Netherlands and the United Kingdom. The satellite was developed, manufactured, integrated and tested by an industrial consortium made up of 32 companies, mostly from Europe, headed by Airospatiale, France.