What changes would you make to solve …?
How would you improve …?
What would happen if …?
Can you elaborate on the reason …?
Can you propose an alternative…?
Can you invent …?
How would you adapt ___ to create a different …?
How could you change (modify) the plot (plan) …?
What could be done to minimize (maximize) …?
What way would you design …?
What could be combined to improve (change) …?
Suppose you could ___ what would you do …?
How would you test …?
Can you formulate a theory for …?
Can you predict the outcome if …?
How would you estimate the results for …?
What facts can you compile …?
Can you construct a model that would change …?
Can you think of an original way for the …?