The strain theory posits that juvenile delinquency is a result of the strain experienced by individuals who are unable to achieve their goals through legitimate means due to structural factors such as poverty and economic inequality.

Robert K. Merton developed the strain theory of juvenile delinquency in his 1938 paper titled 'Social Structure and Anomie.'

Merton identified two main types of strain: structural strain, which arises from the gap between culturally prescribed goals and the legitimate means available to achieve them, and cultural strain, which arises from the conflict between different cultural values and norms.

Anomie, a key concept in the strain theory, refers to a state of normlessness and value conflict that arises when there is a discrepancy between culturally prescribed goals and the legitimate means available to achieve them.

Strain can lead to juvenile delinquency through a combination of frustration, anger, hopelessness, despair, and a desire for revenge, which may motivate individuals to engage in delinquent behavior as a means of coping with their strain.

Individuals experiencing strain may adopt various coping mechanisms, including conformity (accepting both the goals and the means to achieve them), innovation (accepting the goals but rejecting the legitimate means), ritualism (rejecting the goals but accepting the means), and retreatism (rejecting both the goals and the means).

Innovation, as defined by the strain theory, involves accepting the culturally prescribed goals but rejecting the legitimate means to achieve them. Stealing to obtain money for basic necessities is an example of innovation, as it involves accepting the goal of having money but rejecting the legitimate means of earning it.

Structural strain arises from the gap between culturally prescribed goals and the legitimate means available to achieve them, while cultural strain arises from the conflict between different cultural values and norms.

The strain theory suggests that certain social groups experience higher rates of juvenile delinquency due to a combination of factors, including higher levels of poverty and economic inequality, weaker social support networks, and less access to educational and employment opportunities.

The strain theory has been criticized for being too deterministic, ignoring the role of individual agency, not adequately explaining why some individuals experiencing strain engage in delinquency while others do not, and focusing too much on structural factors while neglecting the role of cultural and psychological factors.

The strain theory is still considered a valuable tool for understanding juvenile delinquency because it provides a comprehensive framework for understanding the relationship between social structure and juvenile delinquency, it has been supported by a large body of empirical research, and it has been used to develop effective prevention and intervention programs.

The strain theory can be used to inform policy and practice aimed at reducing juvenile delinquency by addressing the structural factors that contribute to strain, strengthening social support networks and providing opportunities for education and employment, and developing prevention and intervention programs that target the underlying causes of strain.

Key theoretical concepts related to the strain theory include anomie, structural strain, cultural strain, and social control.

The strain theory is compatible with other theories of juvenile delinquency, such as social control theory and labeling theory, and can be used to provide a more comprehensive understanding of the phenomenon.