The Decision component of the Activation-Decision-Construction-Action theory (ADCAT) proposes that if people perceive the benefits of lying higher than the truth, they are more likely to lie. To expand on the existing ADCAT research, the current study investigated the cost-benefit appraisals of 115 children ages 7-to-14 when concealing information about school bullying. Further, the current study examined the impact of the type of bullying (verbal vs. physical), type of exposure to bullying (victim vs. bystander-witness), and familiarity of the person to whom they could disclose (familiar adult vs. unfamiliar adult) when evaluating ADCAT. The results indicate that the expected value of lie-telling and motivation to lie were only significantly related to decisions to lie when the child is the victim of physical bullying and being questioned by a familiar person. Whereas the expected value of truth-telling was only significantly related to decisions to lie when the child is the victim of verbal bullying and being questioned by an unfamiliar person. Discriminant function analysis models were also statistically significant for these two vignettes, meaning that ADCAT-dependent measures could be used to accurately classify the truth and lie tellers for these two vignettes. Furthermore, developmental factors such as age, gender and Theory-of-Mind skills of the ADCAT-dependent measures within each scenario were examined. This study provides further understanding of the complexities in cases of school bullying, particularly as it relates to social-cognitive factors that encourage or discourage children and adolescents from disclosing these events.