There is nothing particularly controversial about the statement that health is more than the mere absence of disease. Positive adaptation, overall well-being, and functional competence are all elements woven into our understanding of what it means to be healthy. This clarity of terms, however, has not necessarily translated smoothly into the arena of psychology. The elements underlying physical fortitude and homeostasis have been easier to identify and understand than those pertaining to mental function (think of leukocytes and immunoglobulins in the face of infection as easier to grasp than those elusive traits distinguishing victims of sexual abuse who thrive from those who do not). When it comes to psychological health, resilience appears to be a fine idea but a rather ethereal and disembodied abstraction for the field to disentangle effectively.

Resilience, defined in Dante Cicchetti’s foreword as "the more optimistic component of the psychopathology-risk equation" (p. xx), which had already heralded "a reformulation of the deficit models that characterized earlier viewpoints" (p. xix), made its debut in the psychology literature well before the appearance of this book. For example, three chapters on resilience were included in the second volume of the classic Developmental Psychopathology, a tome aptly titled Risk, Disorder, and Adaptation(1). With this new collection, however, superbly edited by Suniya Luthar of Teachers College at Columbia University, the field of psychological resilience has reached a new level of clarity and sophistication. Not only are the processes underlying resilience made explicit and clear (in a way that invites one to think of the book as a psychological counterpart to a textbook of human physiology), but its empirical building blocks are included as integral components. Nothing has gone to waste here: each empirical finding supports a larger concept, and no concept—no matter how small—is made in the absence of solid research backing.

In a masterful final chapter titled "Research on Resilience: An Integrative Review," Luthar and Laura Bidwell Zelazo emphasize that resilience "refers to a process or phenomenon, and not to a trait" (p. 513). Although subtle, the distinction is crucial: it reveals the shortcomings of the resilience-as-leukocyte analogy, making it clear that children are not neatly quantifiable along some hypothetical resilience continuum. Indeed, resilience itself is never measured directly; instead, it is inferred from its defining components of risk and adaptation. The focus then shifts to those predictors and outcomes, and especially to the "modifiable mediators" (p. 514) interspersed between them.

Elements of a child’s proximal environment are foremost among such modifiers. Family characteristics, including consistency in limit-setting and provision of emotional buffering, were first described by Anna Freud after the bombings of London during World War II (2) and, more recently, by Laor et al. (3) during the SCUD attacks on Israel. In both instances parental proximity and affective balance increased the likelihood of a positive outcome (as measured by reduced anxiety). Beyond the immediate family environment, a number of family extenders and substitutes can lead to positive adaptation (including relatives, an appropriate peer group, structured after-school activities, and "urban sanctuaries" such as those described in chapters 13 and 14). An excellent chapter titled "Perceived Discrimination and Resilience" emphasizes the role of prosocial activities that foster ethnic pride and identification as particularly relevant to the optimal development of minority or otherwise disenfranchised children.

Certain traits can make children more likely to fare well, among them intelligence, an internal locus of control, good coping skills, and an "easy" temperament. Within the confines of a given constitutional endowment, early environments can have a lasting—and at times permanent—effect on development. The now classic studies of children raised in Romanian orphanages (4) make a sobering statement about the impact of early deprivation and provide equally promising and hopeful evidence about the potential for enriched environments to foster plasticity and redress early disruptions. In our search for child-specific characteristics that may maximize resilient outcomes, the cautionary tone of Luthar’s epigraph should resonate, as children "cannot make themselves enduringly resilient, remaining robust despite relentless onslaughts of the environment" (p. 532). Even extreme fortitude has its limits. As do genes and brains, so far as we can tell.

The two initial parts of the book are devoted to familial adversities. The 18 chapters cover a wide range of populations (e.g., children of depressed parents, maltreated children) and settings (preschools, poor urban enclaves). Throughout, the tools of developmental psychopathology are effectively put to use, and the resulting data and their implications emerge as robust and convincing. By contrast, biological underpinnings make but a cameo appearance near the book’s end: a third and final part (Commentaries) includes a chapter titled "Toward Building a Better Brain," and another on genetic influences, in addition to the final one by the editor and Zelazo.

Mention of the very short biologically flavored content is not a criticism. Quite the contrary: one of the strengths of this volume is the foresight of its editor to have included these chapters, which point to where the field of resilience is incrementally moving. Highlighting the fact that resilience is not a deterministic but rather a probabilistic process, studies on gene-environment interaction in this section are particularly relevant and welcome. For example, the book appeared in time to include the first (5) but not the second (6) of two important studies on the interplay between serotonin transporter genotypes and the consequences of early maltreatment. Resilience research is clearly in the midst of a biological transformation, and Luthar has been able to capture the ascending wave of this change.

In the end, it is reassuring to know that a seeming oversimplification of pathways to resilience appears to hold true and may even carry prescriptive potential, for "the many decades of stellar research encompassed in this book indicate that in large measure, much of resilient adaptation rests on good relationships" (p. 544, authors’ emphasis). Relationships are plastic and fluid entities, often amenable to molding and optimization: in the hands of the right craftsman they can be fostered and harnessed to the greatest advantage. Concerned clinicians and policy makers alike can do much good by maximally tapping the reservoir of relationships’ deep potential. Luthar’s volume shows some proven ways of doing so.