-NASA's Mars Climate Orbiter
-Ariane 5 Flight 501
-EDS Child Support System
-Soviet Gas Pipeline Explosion
-Heathrow Terminal 5 Opening
-The Mariner 1 Spacecraft
-The Morris Worm
-Patriot Missile Error
-Pentium FDIV bug
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Personal errors natural errors instrumental errors
Some of the reasons are: Systematic measurement errors. Random measurement errors. Poor use of equipment. Recording errors. Calculation errors. Poor plotting. Wrong model.
Sampling and Non sampling errors
These errors occur due to chance. These errors tend to cancel to each other in long run. These errors are random. They are not the results of any prejudice or bais.
Errors that do not affect the trial balance errors that affect the outcome of the trial balance