Askwall studied search strategies used when the text was presented sentence by sentence. She found forward search (sentences in sequence) was used 32% of the time with VDU and 20% with paper. Selective search (pick random sentences to search for the answer) was used 49% by VDU and 15% by paper. Zig-zag searching (backing up and then reading forward repeatedly) 17% VDU and 43% paper. Dog-earing (marking a sentence and rereading it as desired) 0% VDU and 18% paper.