Instruction aligned to the NGSS (next generation science standards) represents significant innovations in science classrooms. One of the biggest innovations is that instruction based on the NGSS involves students using their understanding of fundamental science principles to make sense of phenomena (things that happen that students can see in the world around them). Students need science classes that allow them to build learning related to multiple standards over a longer period of time. Here are some examples of the differences in science education nationally and here at BMES:  http://www.nextgenscience.org/sites/ngss/files/15-041_Achieve_ScienceChartNewVision.pdf