" In any case, a major life decision requires: Articulation of the options, e.g. have zero children; have a specific number of children; sponsor one or more children via a charity. Enumeration of the advantages and disadvantages of each option, e.g. freedom to travel; ability to devote time to work; risk of disruption or grief due to actions of child. Each factor needs to be assigned an agreed weight. Objective comparison of the options using the above. An implementation plan, which may reveal new factors, requiring revision of (1), (2) and (3). "

― Graeme Simsion , The Rosie Effect (Don Tillman, #2)