$4\mathrm{.}2$ Write the acceptance criteria for the user story that describes the use of the favorites feature found on most web browsers.

$4\mathrm{.}4$ Where would you get the historic date needed to estimate the development time for the user stories in a prototype before it is written.

$4\mathrm{.}5$ Create a series of sketches representing the key screens for a paper prototype for the shopping list app in $4\mathrm{.}3$

$4\mathrm{.}7$ What data points are needed to make the go no go decision during the assessment of an evolutionary prototype.