Stalin's chief aim was to expand industrial production. For this, he developed three Five-year Plans between 1928 and 1938. Gosplan, the state planning agency, drew up targets for production for each factory. The first two plans concentrated on improving heavy industry - coal, oil, steel and electricity.
Some keen young Communists, called Pioneers, went into barren areas and set up new towns and industries from nothing. There were champion workers called Stakhanovites, named after a coal miner who broke the record for the amount of coal dug up in a single shift. Education schemes were introduced to train skilled, literate workers.
The Soviet Union also gave opportunities to women - crèches were set up so they could also work. Women became doctors and scientists, as well as canal diggers and steel workers.
At the same time, many of the workers were slave workers and kulaks from the gulag. Strikers were shot, and wreckers (slow workers) could be executed or imprisoned. Thousands died from accidents, starvation or cold. Housing and wages were terrible, and no consumer goods were produced for people.
But the improvements in production between 1928 and 1937 were phenomenal:
Other key achievements you need to know of are: