While his Soviet contemporaries praised Stalin's clarity and brevity in the design of these forms, modern scholars have observed a significant dumbing-down of the original proposals. A lot of information, e.g., about the social structures and income, and migration, could not be deduced from the new forms. Some questions (like the social category) were extremely vague and allowed different interpretations. Volkov argues that it was done deliberately. Stalin removed the double accounting (of those present at the time of census and of those permanently living at an address), thus significantly reducing the accuracy of the calculations. It was coupled with a very maladroit time for the census: the night from 5 to 6 January – that is, the eve of Russian Orthodox Christmas, when people are extremely mobile.