Cut and sort. First sort each method into primary or secondary research. Then discuss which methods could answer different design questions.
Interview an intended user.
Read a teacher-selected article about material properties.
Measure the width of the object that must fit.
Observe a user opening and closing the product.
Watch a reliable demonstration of a mechanism.
Test which cardboard fold is stiffest.
Look up manufacturer dimensions for a comparable product.
Survey several users about a preference.
Analyse a diagram showing how a hinge works.
Time how long a user takes to complete the task.