To find broad information on your populations, please check out the resources on this page.
Pick an encyclopedia that covers your age group (e.g. children, adolescents, adults). Then search for your focus (e.g. attention deficit/hyperactivity disorder, autism, etc.). It also wouldn't hurt to try looking for specific types of addiction (e.g. alcohol) or mental health issues (e.g. depression).
Evidence based practice (EBP) is the conscientious use of current and best evidence to make informed decisions. When such decisions involve patient care, you want to make sure your evidence is sound. In communities (such as human development and family studies) that evidence comes from peer-reviewed studies published in scholarly/scientific journals.
To search for evidence, try the following resources:
In PsycINFO (a psychology database), you can limit your results by Age Group. If you're investigating strategies for children with ADHD, for example, check Preschool, School Age, and Adolescence. Click on Advanced Search above the search bar to see these options.
In CINAHL (a nursing database), you can limit your results by Age Groups. If you're investigating strategies for children with ADHD, for example, check Child (Preschool), Child,and Adolescent.
For both databases, you can be begin with a general search. Try "ADHD" (you should also try the full term, "Attention-deficit/hyperactivity disorder") and "intervention strategies." But as you find specific strategies, it would be a good idea to search them specifically.
There's no way to limit by intervention type: primary, secondary, or tertiary. So, you'll have to read each article to determine if its designed to prevent a disorder/disease/crisis/etc, provide early detection and/or treatment, or offer interventions and/or rehabilitation.