because they are so insistently told not to be preemptive. There is danger here that you will never
see what you are aiming for, and without such a vision, design is impossible. Flexibility and willingness to learn from the data do not require lack
of purpose. The ability to see and design the overall project is particularly
important in comparative research and in projects that combine different
sorts of data. We discuss two such design challenges below: comparative
design and triangulated design