The "OV Chipkaart" ticket system (similar to London's Oyster) is now mandatory in Amsterdam for trams, the metro and city buses. Unfortunately the handy "strippenkaart" strip tickets are no longer valid in Amsterdam.

Useful explanation (in English) of the OV chipkaart at:
www.amsterdamtips.com/tips/ov-chipkaart.php

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This is a blue multi-strip ticket which can be used on trams, metros and buses in Amsterdam and all over Holland. Works out about half the price of buying a ticket on board.

See www.gvb.nl (Amsterdam Transport organisation, mainly in Dutch)
Good English explanation of the Strippenkaart at
www.amsterdamtips.com/getting-around-amsterdam-the-strippenkaart.php

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