Table 1. Classification of statements in Q according to interpretative power.

		Stability (variability, SE of z-score)
		High	Low
Salience (magnitude of z-score)	High	Highest interpretative power, very reliable	Meaningful within the factor but its relative position is fuzzy
	Low	Reliable but not particularly meaningful to interpret the factor	Lowest interpretative power, less reliable (although its instability and disengagement might have a relevant conceptual explanation)