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Rubric
Name: Constructing explanations (for science) and designing solutions (for engineering)
Advanced: Student constructs a written explanation that articulates the half-silvered surface mechanism with precision — specifying that the half-silvered coating reflects and transmits roughly equal fractions of incident light, and that the perceived effect (mirror vs. window) is determined by the ratio of reflected light intensity to transmitted light intensity reaching each observer's eye. The explanation anticipates a boundary condition: if lighting levels equalize, the effect disappears and both sides see a partially transparent, partially reflective surface. The design proposal includes a labeled diagram with explicit comparative lighting conditions (e.g., hallway at least two to three times brighter than office interior), addresses at least one real-world constraint such as glare for hallway passersby or the need for adjustable lighting at different times of day, and proposes a testable criterion — such as a specific brightness ratio — that could be used to evaluate whether the design succeeds.
Beginning: Student writes or states that the glass 'reflects some light and lets some through' but does not connect this to the relative brightness on each side or to the half-silvered surface as a cause. The design proposal names a one-way mirror as the solution but provides no lighting specifications (e.g., which side should be brighter, by how much) and does not reference the cause-and-effect mechanism from the investigation.
Dimension: SEP
Developing: Student constructs a written explanation that identifies relative light intensity on each side of the glass as the cause of the mirror-or-window effect, and references the half-silvered surface as the mechanism, but the explanation is incomplete — for example, it addresses reflection without explaining why transmitted light becomes visible only when it is brighter than reflected light. The design proposal specifies that the counseling office interior must be kept dim and the hallway must be brightly lit, but does not include a labeled diagram or quantitative/comparative lighting rationale tied to the investigation data.
Proficient: Student constructs a written explanation that links the half-silvered surface (partial transmission and partial reflection at the glass) to the cause-and-effect relationship: when one side is significantly brighter, reflected light from that side overwhelms the dimmer transmitted light from the other side, producing a mirror effect for the brighter-side observer and a window effect for the dimmer-side observer. The design proposal includes a labeled diagram of the counseling office window showing interior dimming and hallway lighting, explicitly stating which side must be brighter and why, with direct reference to the mechanism explained in the science portion.
Procedure
Phenomenon
Task Scenario
Teacher Notes
Ngss Alignment
Driving Question
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