"Dicuss the Economic and Political impact of the NEP between 1921 and 1924"
well you could look at now NEP was introduced to regain favor with the peasents after the disasterous events of war communism - i owuld have lead up sayign why NEP was necessary.
economic impact - you could talk abut hte reintroduction of limited forms of capiatlism, the growth of inudstry and agriculture to pre-war levels.
Political impact you could mention the split they had at hte beginign of 1921 when deciding to impliment the 3 way split that was happening b/w trotksy v lenin v buckarin.