Answer:
The first Five Year Plan (lasted form 1928 to 1933), was arguably the most successful of the thriteen plans, this plan quadrupled the number of workers in industries, transportation, and construction. All industrial production improved and the Soviet Union became a leading industrial power throughout Europe. The Second Five Year Plan, however (going from 1933 to 1938) was much less effective.
There were like a total of thirteen five-year plans, but the first one seems to be teh only one that was really effective.