Not always sometimes the ideas in the topic will decide what order it is in, but sometimes its just telling you what it will be about but it could be any order.
Westerberg describes Chris McCandless to Jon Krakauer, who the reader knows has come to interview him about McCandless. Krakauer relates that Westerberg, then overseeing a barley harvest in Montana, picked up McCandless while he was hitchhiking. Westerberg remembers him as restless and handsome, with a sensitive face and a lean physique. He mentions that women would likely have found him attractive, but also describes his face as alternating between animated and slack. Alex was engaging and friendly.
