Abstract: We now consider the category of simplicial sheaves in the Nisnevich topology and give this a model category structure whose associated homotopy category is called the simplicial homotopy category of sheaves. We briefly discuss Quillen functors and give some examples. Finally, we describe the B.G. property for a simplicial presheaf and note that fibrant simplicial sheaves in the Nisnevich topology have the B.G. property.

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