The S.H.E. system has been wonderful. It removes me, the nagging mom, out of the equation. The kids know exactly what they need to do without my having to tell them daily. It took some time to get everything set up, then some training in how to use the system and how to complete certain chores but that little bit of work has saved a ton of aggravation since.
Basically, the system uses 3x5 index cards filed in such a way to maintain household chores. The box itself is divided into three sections; Monday - Friday dividers, days of the month 1-31 dividers, and then monthly dividers.

Once you have your completed list it's time to transfer all of that onto index cards. You will need 3 colors. Mine are yellow for daily and every other day., green for weekly and every other week, orange for monthly and beyond.

Weekly mini cards can go anywhere under Mon - Fri card but remain assigned to that day. Jobs that take longer than 10 minutes are assigned to our designated heavy cleaning days. These are typically bi-monthly or monthly jobs and they are filed under days of the month. Seasonal or annual jobs are filed under monthly tabs.
Once all jobs are completed the kids set their cards aside for me to file in front of the next day. This way I can also do a quick walk through to make sure everything was completed the way they were taught.
The first few times completing a newly added chore is the hardest, especially, if it's a chore that hasn't been done in a while. Once it's done the chore gets easier and easier to do because its maintained. I made cards for everything and I'm still thinking of more to add as I see certain areas that need attention. I even made a weekly chore card for cleaning out the car and a monthly one for washing it.

To keep things flowing well without nagging we have rules and consequences. Morning chores are completed before school. (These are labeled on the cards.) Before any television, tablet, or PlayStation time ALL chores must be completed. If they get on devices before chores are done then they lose those privileges. It really is a huge motivator for our children.
Now there are some of my monthly/seasonal chores that I will occasionally ask the kids if they would like to do and earn some money. My oldest earned $10 by scrubbing the siding on the back porch! I don't pay them to complete their own chores. We don't have a scheduled allowance here, just opportunities to earn some cash now and again.
The system works great for us and I love how the house is coming together!