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I am new to 10.0 and have never used the thiessen polygon tool -- i have a set of points and would like to create a thiessen polygon; what do i need to input (i.e. what type of input (.shp etc)?

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Thiessen polygons/Voronoi Diagrams can be created using this toolbox and it doesn't require ArcInfo or anything else. The input is a point shapefile.

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Dan, I got error - divide by 0. I am working with a large dataset. Is this because there are many points at one location? – user8732 Jan 30 at 19:04
Yes remove the duplicates – Dan Patterson Jan 30 at 23:12
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Here is the ESRI help document for the Create Thiessen Polygon tool: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00080000001m000000.htm

You'll need a license for ArcInfo.

The input must be a point feature class (shapefile, geodatabase layer, etc).

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