Extending Explorer would also present a further problem for users the file collection is typically users' most valuable PIM collection and we did not want participants to take any risks (real or hypothetical) by allowing us to make any changes to their filestore. This would have been a substantial undertaking and since Explorer is proprietary software it would be difficult to effectively integrate GrayArea with the conventional Explorer view. In developing GrayArea we decided not to attempt to extend Windows Explorer. As a result, we changed the GrayArea prototype design from having a fixed height that included a line of files (see Figure 3) to having variable height: users can drag the upper border of GrayArea and adjust its height (see Figure 1). Other participants pointed out that there are times when they prefer not to see files within the GrayArea. One participant was concerned that when the number of files becomes large, important files will not be shown while demoted ones in the GrayArea will. We also analyzed user comments to incorporate their feedback into the final GrayArea design. These led us to choose GrayArea for subsequent formal evaluation.
(e) It is distinctively a novel interface. the application of additional features: reversibility, compression, and search extensions (which we describe further in the discussion section).
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