On a continuum of purely educative to conclusively evaluative, which type of expert testimony is most helpful to legal decision-makers?

 On a continuum of purely educative to conclusively evaluative, which type of expert testimony is most helpful to legal decision-makers?

1.Presenting testimony about common risk factors for recidivism

2.Explaining research results in a hypothetical situation related to the legal issue

3.Relating the research literature to specific of the case

4.Presenting specific aspects of the case and relating these to findings