I need help to design three studies each two experimental design and one quesi-experimental design?

Experimental design, 1-design an original mixed- design( one between subjects and one within subjects variables) about children memory. 2/ design an original experiment to asses the effects of three different methods of teaching. 3/ quasi experimental design by using time series study to assess the affectiveness of an educational intervention for languge/ learning - disabled children. also I have spicefic point that I want you help to design study?