A person may be a candidate for a statutory will if they are likely to have assets when they die but the law does not allow them to make a will, meaning the rules of intestacy apply. However, application of these rules could result in the assets going to people who the will-maker would never have reasonably expected to receive a benefit.
A person may be a candidate for a statutory will if they are under the age of 18 years and have come to own substantial assets either by receiving an inheritance or by generating their own income.
A person may be a candidate for a statutory will if they have an intellectual disability and are likely to receive substantial assets by inheritance or by receiving compensation payment by winning a negligence claim or due to abuse.
A person may be a candidate for a statutory will if they have substantial assets (or are likely to inherit substantial assets) and they have lost capacity through dementia.
Links:-
http://www.austlii.edu.au/au/legis/nsw/consol_act/sa2006138/s18.html