While rubrics can vary according to grade level, goals and expectations of the science experiments, there are three constant aspects to all rubrics: all rubrics measure a stated objective; they are rated using a range of performance levels, usually scored between 1-4, representing a mid-range of "meets expectations" to opposing ends of "not acceptable" and "exceeds expectations." Each level has established characteristics or attributes which a student must meet to gain a specified scored rating.
Science experiments require a student to first and foremost understand and demonstrate basic lab safety skills. Typical attributes for safety include understanding the use and operation of safety goggles, proper clean-up after a spill, proper disposing of chemicals and demonstration of basic first-aid use. Performance ranges are graduated from the lowest, or poorest score, to the highest, or best score. Characteristics of the scores: 1 point-demonstrates poor understanding; 2 points-few errors; 3 points-properly performed and 4 points-above requirements.
Understanding the use and operation of lab equipment is an important area of assessment. Students can be measured in areas such as understanding the use of equipment, proper and safe handling of apparatus and equipment set-up. Characteristics for scoring may range from 1 point;improper use; 2 points-few errors; 3 points-used properly and 4 points-above requirements.
Lab reports are common aspects of a science experiment. In order to assess if a student can demonstrate knowledge and skill in a written report of procedures the rubric characteristics should reflect the scientific method, data collection, drawing conclusion, spelling and grammar.
Scoring characteristics may include: 1 point-data not recorded; 2 points-data missing; 3 points-data taken and recorded and 4 points-data presented clearly with excellent explanation.
Most state educational standards include a technology component. In the science lab there are opportunities for students to use technology, specifically when doing computer work. Among possible characteristics are locating resources for experiment, data analysis and data presentation. Rating characteristics reflected are: 1 point-not done; 2 points-done incorrectly; 3 points-done correctly and 4 points-goes beyond the requirements.