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Incredible Years

Health Factors: Education
Decision Makers: Educators
Evidence Rating: Scientifically Supported
Population Reach: 1-9% of WI's population
Impact on Disparities: Likely to decrease disparities

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Incredible Years offers parent, teacher, and child training, teaching parents how to parent more effectively and warmly, teachers how to manage classrooms more effectively, and children how to better manage their interpersonal relationships. The program focuses on children up to 12 years old that exhibit or are at risk for behavioral problems (Blueprints).

Expected Beneficial Outcomes

Improved child behavior
Improved parenting
Improved classroom management
Improved social emotional skills
Increased school engagement

Evidence of Effectiveness

There is strong evidence that Incredible Years (IY) reduces children’s behavioral problems (YG-IY, Menting 2013, Perrin 2014). The program also improves parenting skills (Hurlburt 2013, Perrin 2014) and teacher’s classroom management abilities (YG-IYBlueprints, Hutchings 2013).

IY reduces children’s behavior problems at home and at school (BlueprintsPPN). The program also reduces children’s aggressive behavior and improves conflict management and social skills. Participation increases children's cooperation and positive interactions with teachers, parents, and peers (Blueprints).

Children with more severe behavior issues prior to program participation have the greatest improvements in behavior over the course of IY (Menting 2013, YG-IY). Parent interventions such as IY are effective for preschoolers with Attention Deficit Hyperactivity Disorder (Mulqueen 2015). IY appears especially effective for children with conduct disorder (Presnall 2014) and Oppositional Defiant Disorder (Hobbel 2013). Preliminary evidence suggests that the program’s positive effects may last through adolescence (Webster-Stratton 2011), including reductions in antisocial behavior and improvements in academic outcomes (Scott 2014).

IY helps parents parent more positively and warmly. The program also helps parents set effective limits and reduces spanking, harsh discipline, and criticism (Blueprints). The IY parent training program is especially effective for parents of young children (Pidano 2015). IY participation improves parenting practices among parents with a history of child maltreatment (Hurlburt 2013). Teachers who undergo IY training offer more praise and encouragement, and do not harshly punish or criticize their students as often as non-participating peers. Students of IY-trained teachers behave better and become more academically engaged than non-participating peers; young children also gain more school readiness skills (Blueprints, Hutchings 2013).

To implement the program successfully, IY developers recommend choosing group trainers with applicable education and experience, providing ongoing mentor support and peer support for trainers and teachers, adhering to the program’s prescribed protocols, sequence, and session length (Webster-Stratton 2011a), and extending consultation and expert coaching for trainers beyond the standard 3-day sessions (Webster-Stratton 2014).

The IY curriculum costs $425 to $1,970 per training program (IY).


United States

IY has been translated into many languages and is being used in over 20 countries. As of 2016, there are 21 certified trainers, 9 trainers in the certification process, and over 16,600 trained IY group leaders across the United States (IY).

Implementation Resources

IY - The Incredible Years (IY). Parents, teachers, and children training series. Accessed on November 17, 2017

Citations - Description

Blueprints - Center for the Study and Prevention of Violence (CSPV). Blueprints for healthy youth development. Accessed on June 20, 2018

Citations - Evidence

Blueprints - Center for the Study and Prevention of Violence (CSPV). Blueprints for healthy youth development. Accessed on June 20, 2018
Hobbel 2013* - Hobbel S, Drugli MB. Symptom changes of oppositional defiant disorder after treatment with the Incredible Years Program. Nordic Journal of Psychiatry. 2013;67(2):97-103. Accessed on December 19, 2016
Hurlburt 2013* - Hurlburt MS, Nguyen K, Reid J, Webster-Stratton C, Zhang J. Efficacy of the Incredible Years group parent program with families in Head Start who self-reported a history of child maltreatment. Child Abuse & Neglect. 2013;37(8):531-543. Accessed on December 16, 2016
Hutchings 2013* - Hutchings J, Martin-Forbes P, Daley D, Williams ME. A randomized controlled trial of the impact of a teacher classroom management program on the classroom behavior of children with and without behavior problems. Journal of School Psychology. 2013;51(5):571-585. Accessed on December 16, 2016
IY - The Incredible Years (IY). Parents, teachers, and children training series. Accessed on November 17, 2017
Menting 2013* - Menting ATA, Orobio de Castro B, Matthys W. Effectiveness of the Incredible Years parent training to modify disruptive and prosocial child behavior: A meta-analytic review. Clinical Psychology Review. 2013;33(8):901-913. Accessed on December 16, 2016
Mulqueen 2015 - Mulqueen JM, Bartley CA, Bloch MH. Meta-analysis: Parental interventions for preschool ADHD. Journal of Attention Disorders. 2015;19(2):118-124. Accessed on December 16, 2016
Perrin 2014* - Perrin EC, Sheldrick RC, McMenamy JM, Henson BS, Carter AS. Improving parenting skills for families of young children in pediatric settings: A randomized clinical trial. JAMA Pediatrics. 2014;168(1):16-24. Accessed on December 16, 2016
Pidano 2015 - Pidano AE, Allen AR. The Incredible Years series: A review of the independent research base. Journal of Child and Family Studies. 2015;24(7):1898-1916. Accessed on December 16, 2016
PPN - Promising Practices Network (PPN). On children, families and communities. Accessed on October 17, 2018
Presnall 2014* - Presnall N, Webster-Stratton CH, Constantino JN. Parent training: Equivalent improvement in externalizing behavior for children with and without familial risk. Journal of the American Academy of Child & Adolescent Psychiatry. 2014;53(8):879-887.e2. Accessed on December 19, 2016
Scott 2014 - Scott S, Briskman J, O’Connor TG. Early prevention of antisocial personality: Long-term follow-up of two randomized controlled trials comparing indicated and selective approaches. American Journal of Psychiatry. 2014;171(6):649-657. Accessed on December 16, 2016
Webster-Stratton 2011* - Webster-Stratton C, Rinaldi J, Reid JM. Long-term outcomes of Incredible Years parenting program: Predictors of adolescent adjustment. Child and Adolescent Mental Health. 2011;16(1):38-46. Accessed on December 7, 2016
Webster-Stratton 2011a* - Webster-Stratton C, Reinke WM, Newcomer LL, Herman KC. The Incredible Years teacher classroom management training: The methods and principles that support fidelity of training delivery. School Psychology Review. 2011;40(4):509-29. Accessed on December 7, 2016
Webster-Stratton 2014* - Webster-Stratton CH, Reid MJ, Marsenich L. Improving therapist fidelity during implementation of evidence-based practices: Incredible Years program. Psychiatric Services. 2014;65(6):789-795. Accessed on December 16, 2016
YG-IY - (YG), Interagency Working Group on Youth Programs (IWGYP). The Incredible Years (IY). Accessed on December 7, 2016

Citations - Implementation

IY - The Incredible Years (IY). Parents, teachers, and children training series. Accessed on November 17, 2017

Page Last Updated

December 19, 2016

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