Some researchers question what conclusions can be drawn from studies that show benefits from shared parenting, since children being raised in joint custody arrangements probably have parents who get along better – a situation that would not necessarily extend to those compelled to adopt shared custody. "It's not the amount of parenting time but the quality of parenting and the quality of co-parenting that matter," said Robert Emery, a UVA professor of psychology and author of "Two Homes, One Childhood."