My partner is an elementary school principal. Her school has a small "data room", only accessed by teachers, in which she has posted "data walls". Her data walls are actually printouts of very large spreadsheets -- each row is a child, and the hundred of columns represent individual concepts that children have to master. For example, one column might represent "being able to add fractions", another might represent "being able to subtract fractions", another might be "being able to correctly conjugate verbs", etc.
The really cool thing is that these spreadsheets are generated (by software) after the children take computerized tests. Instead of just giving a numeric score, the software will show exactly *which* concepts the child does and does not know.
You would think teachers would love this technology because it would allow them to focus their instruction time on concepts their students have not mastered. Sadly, that's not the case -- instead, many long-time teachers who had always gotten "good" and "excellent" evaluations are suddenly being shown that they are not actually very good teachers. For example, the software can easily show that *none* of the students in a particular classroom have mastered a particular concept, such as adding fractions. If no student in that particular elementary classroom is able to add fractions, then it is pretty obvious that the teacher in that classroom does not know how to effectively teach adding fractions. Hearing that is pretty threatening to a teacher who has taught the same way for two or three decades.
Anyway, I posted because what the article calls a "data wall" is not really a data wall.