CWI is a five minute walk away from NS station Amsterdam Science Park. This station is served four times an hour from the directions Amsterdam Centraal – Schiphol and Almere – Amersfoort.
Walk through the tunnel after leaving the platform for the science park (northeast exit), cross the street (Carolina MacGillavrylaan) at the crosswalk and walk past the brown building of Amsterdam University College. You will be able to see CWI’s main entrance on your left behind the parking lot.
Alternatively, bus 40 serves Amsterdam Science Park four times an hour from stations Amsterdam Amstel (train, metro, tram) and Amsterdam Muiderpoort (train, tram). Get off at bus stop 'Amsterdam University'. During rush hour bus 240 can be used, too.
At Amsterdam Central Station, take tram 9 to Diemen. Get off at Kruislaan (situated at the Middenlaan - Kruislaan intersection). From here, you can walk to Amsterdam Science Park (15 min) or switch to bus 40.
See also public transport (OV) planner 9292.
Science Park Amsterdam map in pdf format.