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...Chapter group experimental designs causal explanation difficulties in true experiments association agency based research time order quasi nonspuriousness nonequivalent control mechanism series context to monitor programs types of nonexperimental threats the validity implications for evidence practice internal diversity design and noncomparable groups endogenous change ethical issues unique external events deception contamination selective distribution benefits treatment misidentification conclusion generalizability key terms sample highlights discussion questions critiquing reactivity making why experiment developing a proposal web exercises sage publications fundamentals social work o intensive home family interventions result higher rates reunifica tion than traditional services or are any observed differences due some other factor unrelated can we conclude that intervention caused improved dfamily reunification something else these were ques tions elaine walton her colleagues lewis ...