| User
Perception of Reliability |
|
|
|
|
|
|
|
| 1. A personal computer that crashes
frequently v. a machine |
||||||
| that
is out of service for two days. |
||||||
| 2. A database system that crashes
frequently but comes back |
||||||
| quickly
with no loss of data v. a system that fails once in |
||||||
| three
years but data has to be restored from backup. |
||||||
| 3. A system that does not fail but has
unpredictable periods |
||||||
| when it runs
very slowly. |
||||||
| 6 |