Step 1: Expect less, get more. Neutralize frustrations that are eroding your relationship -- Step 2: Give incentives and rewards. Do and say simple things to keep your partner happy -- Step 3: Have daily briefings. Practice the 10-minute rule to really get to know your spouse -- Step 4: Implement change. Take risks to reduce boredom and keep things fresh -- Step 5: Keep costs low, benefits high. Audit marriage behaviors to weed out the unprofitable ones -- Conclusion.