Table 1.

Main functions and characteristics of competence, acquisition and performance levels as related to individual differences in learning skills and comorbidity of learning disorders.

	Function(s)	Characteristics	Specificity/Overlap
Competence	Ability to activate a specific set of representations and processes	-Domain-dependent -Task-independent -Sensitive to practice	Dissociation of deficit
Acquisition	-Learning specific rules and/or regularities	-Domain-dependent
	-Learning direct memory traces (instances)	-Item specific -Domain-independent	Learning disorders across different domains (comorbidity)
	-Learning typical task formats, characteristic of a given behaviour	-Partially domain-dependent
Performance	Actual performance depends on the characteristics of the task	-Task-dependent -Partially domain-dependent -Sensitive to practice	Both associations and dissociations depending on task similarity