Some people may think if being an expert in your field makes you a better teacher, and although you need to be sufficient in the know in the topic your teaching, being a bigger expert doesn’t make you a better teacher by definition. As part of an unusual study by Sadler et al. showed that while most of the teachers were well-versed in their subject, those better able to predict their students’ wrong answers on standardized tests helped students learn the most. Sadler and his colleagues tested 181 middle school physical science teachers and 9556 of their students.
From the press release:
For the study described in their paper, Sadler and his colleagues asked teachers to answer each question twice, once to give the scientifically correct answer, and the second time to predict which wrong answer their students were likeliest to choose. Students were then given the tests three times throughout the year to determine whether their knowledge improved.
The results showed that students’ scores showed the most improvement when teachers were able to predict their students’ wrong answers.
“Nobody has quite used test questions before in this way,” Sadler said. “What I had noticed, even before we did this study, was that the most amazing science teachers actually know what their students’ wrong ideas are. It occurred to us that there might be a way to measure this kind of teacher knowledge easily without needing to spend long periods of time observing teachers in their classrooms.”
To help teachers hone this knowledge, Sadler and his colleagues have made the kind of tests used in their study publicly available. More than a dozen tests covering kindergarten through grade 12 are downloadable here, after completing a tutorial on their development and interpretation.
Going forward, Sadler said he hopes to conduct similar studies in the life sciences, particularly around concepts such as evolution and heredity. He also plans to study what types of professional development and new teacher preparation programs help improve instructors’ facility in knowing what their students know.
Ultimately, Sadler said, he hopes teachers will be able to use the tests to help design lessons that change students’ incorrect ideas and help them learn science more quickly and easily. This is particularly important as states adopt the recently released Next Generation Science Standards.
“State certification for teaching science might well include making sure that new teachers are aware of the common student misconceptions that they will encounter, as well as being proficient in the underlying science,” said Sadler. “Prior to this, there has never been an easy way to measure teachers’ knowledge of student thinking, while we have probably been placing too much emphasis on testing for advanced scientific knowledge.
“Everyone has had a teacher or professor who is incredibly knowledgeable about their field, yet some of them are less-than-stellar teachers,” he continued. “One of the reasons for this is that teachers can be unaware of what is going on in their students’ heads, even though they may have had exactly the same ideas when they were students themselves. Knowledge of student misconceptions is a critical tool for science teachers. It can help teachers to decide which demonstration to do in class, and to start the lesson by asking students to predict what’s going to happen. If a teacher doesn’t have this special kind of knowledge, though, it’s nearly impossible to change students’ ideas.
“The best teachers base their lessons on what the American humorist-philosopher Will Rogers observed: It ain’t what they don’t know that gives them trouble, it’s what they know that ain’t so.”
Abstract of the research:
This study examines the relationship between teacher knowledge and student learning for 9,556 students of 181 middle school physical science teachers. Assessment instruments based on the National Science Education Standards with 20 items in common were administered several times during the school year to both students and their teachers. For items that had a very popular wrong answer, the teachers who could identify this misconception had larger classroom gains, much larger than if the teachers knew only the correct answer. On items on which students did not exhibit misconceptions, teacher subject matter knowledge alone accounted for higher student gains. This finding suggests that a teacher’s ability to identify students’ most common wrong answer on multiple-choice items, a form of pedagogical content knowledge, is an additional measure of science teacher competence.