The two methods and their local variables: +--------+ +--------+ | main | | toDays | | | | | | millis | | millis | | days | | answer | +--------+ +--------+ How do we get millis in main to millis in toDays? ----------------------------------------------------------------- We introduce a parameter to send a value from main INTO toDays +--------+ +--------+ | main | | toDays | | | | | | millis | ----> | millis | | days | | answer | +--------+ +--------+ How do we get answer in toDays to days in main? ----------------------------------------------------------------- We use a return statement in toDays to send a value OUT of toDays and an assignment statement in main to receive the value being returned: +--------+ +--------+ | main | | toDays | | | | | | millis | ----> | millis | | days | <---- | answer | +--------+ +--------+