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ALMA is openly used by researchers around the world. ALMA observation proposals are solicited worldwide and the selection committee selects observation programs to be given priority.

Observation time will be allocated to North America (approx.30%), the European Southern Observatory (ESO) member states (approx. 30%), East Asia (approx. 20%), and to the host country, Chile (approx. 10%) and the rest (up to 5%) will be allocated to researchers of other regions (based on open sky policy). The observing time are divided among North America, ESO member states, and East Asia in proportion to their shares of contributions for ALMA construction and operations.
In accordance with this policy, ALMA is openly available to every researcher around the world regardless of the regions or institutes to which they belong.
The first call for proposals was issued in March 2011, and the sixth round of the scientific observation is scheduled for 2017.
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