Background (cont)
For DEV thesis, you might conclude that previous systems ...
- did not exist (nobody has ever built a system to do this)
- were too inefficient
- had usability problems
For RES thesis, you might conclude that previous methods ...
- did not work for a certain class of data
- were inefficient for a certain class of data
- were not elegant
Ultimately, you must show that your approach effectively addresses the problem.
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