I want to take a moment to comment on grading at OMS and specifically in science class.
We use a 4 point scale that is well thought out. The goal has been to make grading meaningful to teachers, parents and students.
The first point is that students have at least three chances (called events) to demonstrate their ability or knowledge with any skill. Science has five skills or essential standards.
Students should move up the grading scale as they work through the events. Part of the design is to show growth. Much practice and reflection is done between events. Think of event scores as the knowledge level for that moment. Students get the chance to see what they know along the way and then work to make improvements. Only at the end of the semester is the grade really final.
Beck's simplified scale:
0= no work or evidence
.5, 1.0, 1.5 degress of the student needing help to complete or indicates that even the basic skills are not understood.
2.0 Basic skill demonstrated
2.5 Basic skill plus a partial understanding of the complex ideas demonstrated
3.0 What ever the teacher taught I demonstrated I could do it
the goal is for all students to have 3's in all skill areas
3.5, 4.0 indicate an understanding or ability beyond what was taught in class by the teacher