As educators, we are constantly assessing our students. Informal assessments in the form of observation, participation notes, running records, portfolio entries, and discussion go on in every classroom all of the time. I can tell more about how my students truly understand a concept in science by watching then perform an experiment than I can from reading their answers to a multiple choice, true or false, or matching test. While APPLICATION of knowledge is the true hallmark of what a student has learned, we too often rely on an assessment that is sumative - measuring FACTS that a student has memorized. These sumative assessments come at the end of a unit and do not open doors for further learning. A good example of this kind of assessment is the SAT, graduation exams, semester exams, and unit tests. Grades are recorded in a grade book or put on a data base and becomes a piece of information about the student. The information from the test not only fails to give a true understanding of what the student KNOWS, UNDERSTANDS, AND IS ABLE TO APPLY, it fails in a much bigger way. It is not used to drive further instruction.
Formative assessments - usually more informal- allow an instructor to not only measure true student learning, it provides ongoing information about the student that will allow the teacher to plan and implement future lessons that will fill in any gaps, provide future lessons to strengthen skills or to provide enrichment to the students who have mastered skills.
The use of a rubric is an extremely effective way to measure student learning. This rubric should be detailed and shared with students and parents ahead of time. There are many excellent sites on the weve for creating a rubric. I have used http://www.teach-nology.com/web_tools/rubrics/ I think it is extremely important for students to be a partner in their learning experience. A good way to begin this partnership is to engage the students in creating a rubric that will be learned to assess their learning. When students are involved in setting the criteria for learning, they are more likely to succeed.
I see little educational value in summative assessments that do nothing more than provide data. The purpose of assessment should be to drive instruction and to measure understanding, not recall. Performance based assessment, which involves the direct evaluation of student effort on real learning tasks provides useful material for teachers, parents, and students.