Table 3.

Analysis of Necessary Conditions

	High Effectiveness		Non-High Effectiveness
	Consistency	Coverage	Consistency	Coverage
Exclusivity	0.864233	0.805442	0.430675	0.477551
~ Exclusivity	0.439416	0.393464	0.824540	0.878431
Expertise	0.891971	0.806069	0.402454	0.432718
~ Expertise	0.372263	0.343666	0.819632	0.900269
Virtuality	0.878832	0.767857	0.409816	0.426020
~ Virtuality	0.343066	0.328212	0.776687	0.884078
Clear goals	0.716788	0.717836	0.462577	0.551170
~ Clear goals	0.551825	0.463235	0.763190	0.762255
Challenge-skill balance	0.890511	0.801577	0.422086	0.452037
~ Challenge-skill balance	0.391241	0.362652	0.814724	0.898512
Positive experience	0.890511	0.839065	0.407362	0.456671
~ Positive experience	0.423358	0.375162	0.856442	0.902975