Family strengths research often, though not always, fails to recognize the impact of various life-cycle stages on the characteristics of strong families. Research by Olson and colleagues, for example, which does explore the effects of life cycle stage, has suggested that the dynamics most conducive to well-functioning families can vary depending on the structure of the household. Power structures and communication patterns that are effective for families with infants and toddlers may differ widely from families with adolescents and young adults. What is functional at one stage may be dysfunctional in another (Olson et al., 1989). Researchers studying family strengths must bear this in mind as they design studies and interpret findings.