Use a simple example such as, I want to get 1ID and 1OD pop total, 1 pop when guy is 18, 1 pop when he is 25 (arbitrary numbers). Say at 18 it takes 1 week for the ID pop, 2 weeks for the OD pop. At age 25, training slows 50%.So we have 2 options: Train 2 weeks OD at 18, and 2 weeks ID at 25, for total of 4 weeks to get 2 pops.OrTrain 1 week ID at 18 for a pop, train 1 week OD at 18 for half a pop, and train 2 weeks OD at 25 to finish the pop, again 4 weeks.
orthogonal