Advanced Construction

Advanced Construction is a play option for Twilight Imperium (First Edition), introduced with the Borderlands Expansion 
Using this option, players must draw a box on a sheet of paper for each Spacedock they have in play and label which planet each resides.
After purchasing new units, players must secretly allocate their new production to each individual Spacedock.
* The new units are placed in the boxes representing the Spacedock (with piece of paper covering the top to remain secret) 
Immediately before the 'Place New Units' phase, players lift the top piece of paper and must now place their units at the Spacedock to which the unit was allocated
* If a particular Spacedock has been destroyed, all units allocated to that Spacedock are destroyed and will not be placed on the board
* If a Spacedock has been blockaded, all space units built on that Spacedock are destroyed. Ground Forces and P.D.S. can safely be placed on the planet, however.