Foster said the All Blacks had been working on what to expect in Japan for the past few years, and a two week trip to the country last November was an important part of that process.
You plan to the best of your ability, but part of that is you know things are going to pop up that you hadn't really thought of; you just have to deal with them calmly and go about things the way we normally do.
"Until you're in the middle of it you've just got to make smart decisions."
Coming out of their final warm-up match, a 92-7 thrashing of Tonga, unscathed, the All Blacks look to be in the best possible position heading into the World Cup. While lock Brodie Retallick will likely remain sidelined until the knockout stages, players nursing niggling injuries such as Richie Mo'unga and Rieko Ioane looked as though they would be available for selection for the opening game.
New Zealand go into the tournament looking to become the first nation to ever win three in a row, with Sam Whitelock, Sonny Bill Williams, and captain Kieran Read all looking to be a part of their third straight World Cup-winning campaign.
Their veteran presence will be an important part of the All Blacks' tournament, with 19 of the 31-man squad heading into their first World Cup.
"Here we go into another tournament where we're trying to win three in a row and people have been reminding us that's quite hard," Foster said. "So some of the mental challenges are the same as in 2015, and we've got a different group of people so we've got to make sure we deal with things in a way that suits this group not the group we had in 2015.
"Now you're not trying to look back at all, and you're not trying to look too far forward, you're just trying to look at the here and now and think let's just go there and settle in."