HereIam60, I think they needed to make 3 contacts (including doorstep ones) to put it on their time sheet as a bible study and turn in a bible study report (no longer done). As to counting it as considering making contact 3 or more contacts, only one bible study is counted that month with one person (sometimes 2 if husband and wife), and 1 return visit per visit, based on years as a regular pioneer. The counting by parents studying with their changed has changed many times.
Example: One bible student, 3 times before counted as bible study, only one bible study noted on special slip and turned in (to keep track of how many separate individuals, contact info, publication studied...more complicated back then), and a return visit per each contact. Pre-1975, publishers were told that if person not at the kingdom hall after 6 months, to cancel study and move on to find another person who would study. After all the end is close, and can't wait on people for years to even attend one meeting....https://wol.jw.org/en/wol/d/r1/lp-e/1969364#h=3