MECHANICSBURG — The playoff system in Pennsylvania high school sports is all shook up.

That is because the Pennsylvania Interscholastic Athletic Association on Wednesday voted to expand to six classifications in football from four. And it voted to expand basketball, baseball and softball to six classifications from four.

The PIAA board also voted that boys and girls soccer, along with girls volleyball, will increase from three to four classes.

These changes start in the 2016-17 school year.

“Obviously, the vote speaks for itself,” said Scott Heinauer, Mars athletic director and football coach and one of the three WPIAL representatives to vote no. “There’s not a whole lot anybody can do. ... We’re going to look for the good in it.”

Classes are based on student boy and girl enrollment. Those figures for the next cycle, 2016-18, are due by the end of this month.

Classes will be official by December and class brackets will be done by January.

“I’ll be interested to see the further breakdown of what’s going to happen in terms of the WPIAL in terms of how we’ll be with football,” Butler athletic director Bill Mylan said. “I haven’t looked at numbers in basketball and baseball to see where we’re at. Until I see the breakdown, I can’t comment any further.”