You advertise it.
the two types of spreadsheet are manual and electronic...
Set a five year old in front of the computer and tell him/her what the end result should be. If they can figure out how to get there then the software is good.
Children can be abused mentally, physically, sexually and verbally.
there is no way to get them to grow TALLER but when he/her hits their growth spurt feeding them the proper food will help.