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How to reach at IEF ?
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By public transportations (metro/RER) - RATP
The IEF is close to the RER station "Bures-sur-Yvette", on the B line of the RER. There are trains every 15 minutes from and to Paris. It takes about 40 minutes to come from the center of Paris. Coming from Paris or from airports, you have to take a train which final destination is Saint-Rémy-les-Chevreuses. These train names always start by P (Plan, Papy, …). Get out of the train at the Bures-sur-Yvette station, cross the the rails using the underpass and follow one of the footpaths which go down towards the University (cf. map). After the bridge, take on the right and the IEF is the first building on the right-hand side.

By train - SNCF
If you come from Paris, take the RER B line as indicated here above.
Some TGV trains stop at the Massy-TGV station, and then you can take the RER at the Massy station, which is only 15 minutes away from the Bures-sur Yvette station.

By plane:
The airport Roissy-Charles of Gaulle is served by the RER B. If the train which leaves Roissy does not go to Saint-Rémy-les-Chevreuses, go out of the train at any station in Paris, and wait
on the same platform for a train having the right destination. It needs about 1h15mn to come from Roissy to Bures-sur-Yvette.
If you arrive at Orly airport, take the OrlyVal line until Antony where you join the RER B line.
Be careful to take the Saint-Rémy-les-Chevreuses direction before the automatic wickets !
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