In spite of the effort devoted to develop critical system components during advanced development, unknown unknowns can be expected to appear during engineering design. Discuss at least 3 contingency actions a systems engineer should take in anticipation of these "unk-unks". Your answer should include the potential impact on cost, schedule, personnel assignments, and test procedures. (If you have knowledge of a real-life example from your work, you may use that as the basis for your discussion.)