The Psychodynamic Diagnostic Manual takes a slightly different approach to this and other disorders than the DSM does, and attempts to be more descriptive, with some discussion of etiology and treatment possibilities. It also has a discussion of the controversies related to this disorder. If you can get a copy of the PDM, you might find this interesting.

Among other things, the PDM suggests that children with ODD have a developmental history where they had difficulty with emotion regulation and communication of emotions, with frustration and loss being particularly hard. They tend to be sensitive to a lot of things, including sound and touch, and as a result try to control the environment. Children with ODD often feel demoralized and resentful, with self-doubt and self-hatred, and almost always feel that they are not well understood. Their behaviors may be an attempt to preserve a sense of control and self-esteem.

Social and family relationships are usually disrupted, leading to a vicious cycle where the child acts out, others respond with rejection, and the child becomes more rebelious and defiant.

One thing that seems to help is teaching parents more flexible approaches.

I think that it is appropriate for ODD to be discussed in this forum, as children with ODD can often develop personality disorders as they mature, especially without effective treatment.