Bug Type Classification

First of all, bugs are bugs; the name is applied to a huge variety of "things." Types of bugs can range from a nuisance misunderstanding of the interface, to coding errors, to database errors, to systemic failures, and so on.

Like severity, bug classification, or bug types, are usually defined by a local set of rules. These are further modified by factors like reproducibility and fixability.

In a connected system, some types of bugs are system "failures," as opposed to, say, a coding error. For example, the following bugs are caused by missing or broken connections:

· Network outages.

· Communications failures.

· In mobile computing, individual units that are constantly connecting and disconnecting.

· Integration errors.

· Missing or malfunctioning components.

· Timing and synchronization errors.

These bugs are actually system failures. These types of failure can, and probably will, recur in production. Therefore, the tests that found them during the test effort test are very valuable in the production environment. This type of bug is important in the test effectiveness metric.