A challenge is a difficulty that carries within it an opportunity for progress. Once that challenge is overcome, one goes up to a higher level than before, for example take the challenge regarding making the transition to democracy and then instituting democratic government.
This involves bringing down the existing non-democratic regime, keeping military away from controlling government and establishing sovereign and functional state.
Once you are able to keep military away from controlling government you are able to set up democracy. The transition to democracy is successful and the next stage for expansion of democracy is ready.