Through long association with Marines and others used to
hardship, the authors have come to recognize that users do not
generally know what they are missing until a better alternative
is given to them. Landline phones, folding maps, and paper
books all seem quite useful until one has held all three at once
in a single smart phone. Or in the words of Nielsen [7],
“Definitely don’t believe what people predict they may do in
the future.”