Low production quality
Plans did not specify what materials should be used for, therefore little coordination between different factories.
Stalin purged the economic planners and managers
Stalin attacked members of the Gosplan; purged members during 3rd 5 Year Plan.
Materials produced were often stored at a factory and left to decay, rather than being used.
40% of what was produced was wasted.
Plans set targets for production, not quality.
Factory managers rewarded for producing large quantities, regardless of what was actually produced.