Why did Stalin initiate the Five-Year Plans?

The USSR was a poor, backward country that Stalin wanted to transform into a modern, powerful, industrial nation.

There were three main reasons for developing industry quickly...

1. To provide machinery - tractors etc. so that farming was more efficient and more food was produced.

2. To catch up to the Western World and make Russia less dependant on the West for industrial goods.

3. To have a strong industry capable of producing armaments so that Russia could defend itself from attack.

The Five-Year Plans set production targets which industries had to reach.