Avoid Selection Sampling Bias in Portfolios 
Avoid sampling bias by having students include all of their papers or projects in their portfolios. Some teachers prefer a comprehensive portfolio as opposed to a sampling portfolio. To build a comprehensive portfolio, have students arrange their efforts from most effective to least effective, and then ask them to write a comparison/contrast cover letter that justifies the selection of the best piece as offset by the least effective piece.
- Grade Levels K - 2
- Grade Levels 3 - 5
- Grade Levels 6 - 8
- Grade Levels 9 - 12
- Kinesthetic Learner
- Visual Learner
- Auditory Learner
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