State education officials are preparing to roll out a new tool for parents to quickly learn which schools are succeeding and which ones are struggling. They’re also lashing out at another school measurement approach that’s been proposed in the legislature.

The dueling options are part of a national debate about the best way to measure schools.

Michigan’s elected board of education last year scrapped plans to assign letter grades to every school in favor of providing parents with a dashboard of information about test scores, graduation rates, and other measures of success such as attendance rates and student discipline.

That “parent dashboard” was unveiled last month. As soon as next week, the state is planning to beef up the dashboard with a new score, from 0 to 100, that is intended to summarize the quality of every school in the state.

The new index will give each school a single number based on seven factors, including test scores and graduation rates, the availability of classes like art and music, and proficiency rates for English learners. The index was part of the state’s plan to comply with the new federal school accountability law. 

Several factors will go into the index, though most points will be determined by test scores: 34 percent will be based on the percent of students who pass state exams. while 29 percent will be determined by whether test scores show students are improving. The rest of the score will be driven by school quality factors such as availability of arts and music (14 percent), graduation rates (10 percent), and progress by students learning English (10 percent). The last 3 percent will measure the percentage of students who take the state exam — a factor designed to discourage schools from giving the exam only to their highest-performing students.

Venessa Keesler, deputy superintendent at the Michigan Department of Education, said the index is not a ranking system, so multiple schools could end up with the same index score.

That’s a switch from the school ranking system Michigan has been using in recent years in which every school was placed against all other state schools, primarily on test scores. The schools in the bottom 5 percent of state rankings faced intervention, including the threat of closure.  

But GOP lawmakers say the parent dashboard and the index are too complicated, and they want to see an A-F letter grade system.

Lawmakers introduced legislation last week that would give every school a report card with six A-F grades measuring their performance in different categories. Bill sponsor Tim Kelly called it a “middle of the road” option that isn’t as simplistic as giving schools a single letter grade.

That plan came in for significant criticism Tuesday from the state board of education.

“This really isn’t OK,” said Nikki Snyder, a Republican board member. “If we want parents, students and teachers to be empowered, this is not the kind of chaos and confusion we should inject into our system. I absolutely do not support it.”

Another school board member, Casandra Ulbrich, the board’s Democratic co-president, raised concerns over how the scores would be decided.

“Someone has to create a complicated algorithm to determine the difference between A to B to C,” she said. “I have some real concerns about that.”

“I generally agree with Rep. Kelly,” said Richard Zeile, the Republican board co-president, “but school letter grades would be more misleading than helpful.”

A-F school ranking systems, which were used in 18 states as of last spring, have been divisive across the country, with some hailing them is a tool to increase transparency and others viewing them as too simplified and too easy for parents to misunderstand.