Operating An Overhead Projector
| Field | Business, Education |
| Went Obsolete | Still Used |
| Made Obsolete By | Powerpoint |
| Knowledge Assumed | None |
| When useful | As a Backup to Powerpoint, Some instructors still use them heavily |
This is widely used in American universities, with many professors believing transparencies are far superior to powerpoint. It is not at all an obsolete skill.