Table 3.

Dominant reciprocity strategies were defined as follows. When a person used only one strategy more than 30% of the time, they were defined as using that strategy. In cases where more than one strategy was used more than 30% of the time theses rules were used to classify their strategy use. The rules written in bold and italicized, supersede the other rules.

Reciprocity Strategy	Strategy Classification Rules (% of Trials)
Tit-for-Tat	> 50% Tit-for-Tat
Benevolent	> 50% Benevolent
	> 30% Benevolent & >30% Tit-for-Tat
	> 30% Benevolent & >30% Ambivalent
	> 30% Benevolent & >30% Tit-for-Tat & >30% Ambivalent
Ambivalent	> 50% Ambivalent
	> 30% Ambivalent & >30% Tit-for-Tat
Malevolent	> 50% Malevolent
	> 30% Malevolent & >30% Tit-for-Tat
	> 30% Malevolent & >30% Ambivalent
Sporadic	> 30% Benevolent & >30% Malevolent
	> 30% Tit-for-Tat & >30% Benevolent & >30% Malevolent
	> 30% Benevolent & >30% Malevolent & >30% Ambivalent
	< 30% of any particular type