1.2.3 Errors, Defects, and Root Causes

Question 1

Humans make “e… “ which produce “ “ which in turn may result in “f…“.

Answer 1

errors (mistakes)

defects (faults, bugs)

failures

Question 2

Humans make errors for various reasons:
- time “ “
- work pro…
- pro…
- infras… or “ “
- simply “ “
- lack a…

Answer 2

• pressure
• product complexity
• processes
• infrastructure
  interactions
• tired
• adequate training

Question 3

Defects can be found in:
- documentation, like in r… or a t…
- in s…
- in a supporting w… like a b…

Answer 3

• requirements specifications
  test script
• in source code
• work product
  build file

Question 4

Defects in work products produced “e…” in the “ “, if undetected, often lead to d… later in the “ “.

Answer 4

earlier
SDLC
defective work products
lifecycle

Question 5

If a defect in code is executed, the “ “ may fail to do what it s… , or do something it “ “, causing a “f…”.

Answer 5

system
should do
shouldn’t
failure

Question 6

Failures can also be caused by e… like when “ “ or ele… cause f…

Answer 6

environmental conditions
radiation
electromagnetic fields
firmware defects.

Question 7

A root cause is a fundamental “ “ for a p… (a “ “ that leads to an “ “).

Answer 7

reason
problem occurrence
situation
error

Question 8

Root causes are identified through r… , typically performed when a “ “ occurs or a “d…” is “ “.

Answer 8

root cause analysis
failure
defect
identified

Question 9

By addressing the root cause, it is believed that further similar “f…” or “ “ can be “p…” or their f…

Answer 9

failures
defects
prevented
frequencies reduced.