We begin with national and Pennsylvania standards of content areas, breaking them down to behavioral terms.
These are then transfered into a unit and daily instructional objectives.
Other higher education institutions and professional organizations can be great places to begin your research for resources.
However, when resources have not been vetted for you, look for these characteristics:
Relevance to Your Topic
assess timeliness and subject coverage
Validity of the Research
determine the quality of the research
evaluate credentials, education, experience, etc.