This will work only in certain situations. In STC's Electric Circuits unit, teams of students are directed to wire 'houses' made from cardboard cartons. One teacher who used the unit asked each student to wire a separate room. Once the project was complete, students individually diagrammed their wiring schemes. Hold individual conferences or interviews to assess each student's understanding and knowledge.
Some teachers enlist the help of parents, aides, or student teachers.
Students generally look forward to these interviews and don't mind missing recess or anything else for this opportunity. Although the logistics may be difficult, teachers with class sizes over thirty have successfully interviewed all their students. Bear in mind that individual interviews may be something you carry out only two or three times a year. You will still be able to assess each child adequately. Respond to your students' levels of comfort.