[Retracted] An Educational Web-Based Expert System for Novice Highway Technology in Flexible Pavement Maintenance

Table 2

The categorization of domain classification problems.

Category	Parameters	Description
Flexible pavement distress	Type of distress observed	Pavement distress is of many types in flexible pavement evaluation and varies from one agency to another. Malaysia includes 15 types of distress in its survey measures based on JKR (2008). Single or combined distresses.
	Severity of distress	The severity of distress appearance indicates how poor a problem is based on low, medium, and high ratings.
	Density of distress	Density characterizes the percentage of the pavement surface covered by distress based on the density rating (rare, intermittent, frequent, and extensive).
	Road functional class	Functionally related road parameters are classified as major and minor.
	Climate change	Climate change depends on the rainforest or dry climate.