Science Assessment
As you do your Backward Design Process you will find need different assessment methods. Listed below are some links to assessment resources and sample assessments.

Trends in International Mathematics and Science Study - TIMSS

National Assessment of Educational Progress - NAEP - Question DB

Texas Assessment of Knowledge and Skills - TAKS

National Center for Research on Evaluation, Standards, and Student Testing - CRESST

PALS - Performance Assessments Links in Science