What factors made the Great Compromise necessary?

The Great Compromise combined the New Jersey Plan and the Virginia Plan. The New Jersey Plan wanted governmental representation independent on population, therefore the representation would be the same for every state. The Virginia Plan wanted representation to be based on population, therefore some states would have more representation than others. The Great Compromise combined the two, and created the Congress we have today. The Senate is independent of population, and the House of Representatives is based on population.