Evaluate treatment outcomes for children who are unsystematically assigned to treatment and control conditions

answer; randomized controlled trials;

well its is frequent rain

have a good day

this is a pretty broad question and can be a pretty lengthy answer. since 1900, women have gained a lot more rights and have become active in the workforce. with women being in the workforce, men play a larger role in family life. many family tasks are shared between men and women, whereas, women used to be the sole family caretakers.

that should get you started at least.