Question

Describe two reasons why this task may have been difficult to complete successfully.

Answer 1

One reason would be . If your partner and you did not posses a common vocabulary for aspects of the objects, the final design may not match, which will make the holes, solid side, and the bubble become mixed up in the translation
and the other reason is  not being able to successfully describe the depth in which the figure was built., which will create a defect in the structure.