Table 1.

A Description of Typical Differences Between the Psychological and Biodemographic Approaches to Life History Research.

	Biodemographic Approach	Psychological Approach
Assumption	Shared: Humans strategically allocate bioenergetic and material resources toward survival and reproductive goals
Relevant human life history variables	Birthweight, gestational age, growth rates, pubertal timing, number of births	Planning, risk-taking, quality of family and romantic relationships, social support, attitudes toward reproduction
Sample hypotheses	How do nutritional conditions influence age at first birth?	How does perceived economic stability in childhood influence attitudes toward reproduction?