The Atlanta Journal Constitution reporter Heather Vogell conducted a two-year investigation of standardized testing and discovered many errors in them.

Yet with all these errors, the test scores are being used and misused to make life-changing decisions about students, teachers, principals, and schools.

Standardized tests are a weak reed on which to base a decision for firing staff and closing schools.

Vogell and the AJC were key in exposing the widespread cheating scandal in Atlanta. Now the AJC reports:

Miscalculated scores, flawed questions and other errors on standardized tests have become near commonplace in public schools across the country, according to a new investigation by The Atlanta-Journal Constitution.

Repeated failures in quality-control measures have allowed mistakes to keep happening even as testing took on a more crucial role for students and teachers, the newspaper found. In some cases, students have been initially denied diplomas or entry into special academic programs because of incorrect scores.

The findings expose significant problems in the execution of the landmark No Child Left Behind Act of 2001, which sought to use test scores to hold schools publicly accountable for students’ academic performance. The newspaper has previously reported other problems with standardized testing, exposing widespread cheating in Atlanta Public Schools. A follow-up investigation in 2012 revealed nearly 200 school districts nationwide had high concentrations of suspect scores.

In the current year-long investigation, the AJC’s Heather Vogell studied test design, delivery and scoring and reviewed statistical reports on the quality of more than 92,000 test questions given over two years to students in 42 states and Washington, D.C.

The investigation revealed that almost one in 10 tests nationwide contained significant blocks of questions that were likely flawed. Such questions made up 10 percent or more of those tests — threatening their overall quality and raising questions about fairness.

Anyone wanting to read about the built-in flaws of the testing industry should read Todd Farley’s book Making the Grades, which exposes the scandalous lack of qualifications of those hired to score test questions, their poor training and supervision, and the superficial attention they give to the answers students write.