Treating the Big Ideas as sequential steps
Students often think they investigate first, then make, then present, in that order. In practice, all three overlap throughout the course. You investigate during making, and presenting forces you to reflect on your investigation. Portfolios that show only a linear process miss the depth scorers are looking for.
Writing descriptions instead of evidence
The most common written evidence mistake is describing what a piece looks like rather than explaining the materials, processes, and ideas behind it. A scorer can see the piece. Your written evidence needs to tell them what they cannot see: your reasoning, your influences, and your intentions.
Skipping documentation of failed experiments
Students often only document what worked. But evidence of a material test that failed, a composition you rejected, or a process you abandoned is strong proof of genuine investigation. Leaving it out makes your inquiry look shallow even if the finished work is strong.
Confusing synthesis with variety
Having many different pieces in many different styles is not the same as synthesis. Synthesis means bringing your investigation and making together into a coherent body of work. A portfolio with ten unrelated pieces in ten different styles shows range but not synthesis, and synthesis is what Big Idea 2 rewards.
Ignoring viewer interpretation in written evidence
Big Idea 3 asks you to recognize that viewers interpret your work independently. Students who write only about their own intentions without acknowledging how a viewer might read the work are missing part of what presentation means. Your written evidence should show awareness that meaning is constructed by viewers, not just by you.