The methodology used is solid. The authors consider the backlog of studies that have been done on this topic. On one hand, categorizing challenges has a necessarily quantitative element to it.
However, it is subject to some issues, especially revolving around the utilization of language that is difficult to nail down. Psychological Science in the Public Interest ; The authors predictably found in their study that the children from non intact homes showed poorer adjustment during the divorce and separation process.
Importantly, the author came to the conclusion that with a handful of important social indicators, children from divorced homes performed worse than those from intact homes.
A large body of research has mapped out the common reactions to divorce, and identified ways to ease this painful process.