Improvement of Open Source Software Usability: An Empirical Evaluation from Developers' Perspective

Table 1

Coefficient alpha and principal component analysis (PCA) of variables.

Usability factors	Item no.	Coefficient α	PCA eigen value
Users requirements	1–4	0.67	2.19
Usability experts opinion	5–8	0.64	1.22
Incremental design approach	9–12	0.55	1.08
Usability testing	13–16	0.55	0.99
Knowledge of UCD methods	17–20	0.59	1.05