The virginia plan called for members of the senate to be

The Virginia Plan called for members of the Senate to be "elected by State Legislature."

The Virginia Plan was made by James Madison yet introduced to the Constitutional Convention by Edmund Randolph, the legislative leader of Virginia, in 1787. This was a proposition for another type of government and required the quantity of votes each state got in Congress to be founded on populace instead of each state getting one vote.  

The reason of the plan was to ensure the vast states' interests in the new government, which would be more grounded governmentally than under the Articles of Confederation. The Articles of Confederation was the primary type of government and had feeble administrative control; the states had the majority of the power.

answer; by working independently, the states have a high likelihood of developing innovative solutions that can be employed in other states;