| Clue | Source | Date |
|---|---|---|
| Product designer's aim | Eugene Sheffer | 05 Jun 2025 |
| App tester's concern | The Washington Post | 13 Jun 2020 |
| App tester's concern | LA Times Daily | 13 Jun 2020 |
| Product-design goal | ||
| Product-design goal | ||
| Design plus | ||
| Feature of good design | ||
| Widget-maker's concern |