DS/difficult child has had quite a few developmental "bursts" this past 12-18 months. He can pedal a bike, swing on his tush, pull on his pants and most shirts, attend to a handful of activities, and has worked really, really hard increasing his hand strength. I'm sure there's more good I'm missing at the moment. This has also been the hardest time with him so far. About this time last year his behavior crashed and he never recovered. It seems he's starting to crash again. I developed a BIP with the school psychologist after a few weeks of FBAs. We targeted aggressive tantrums, which is a large category but necessary. A few weeks with the BIP in mind, his tantrums did seem to decrease. At the same time, his cursing was increasing. Since we were focused on safety, I left the cursing on the backburner and that was a HUGE mistake. I tried decreasing the time between rewards, and his behavior started to get worse. I bumped back up the rewards and the behavior slightly decreased again. I tried decreasing again, and there's no motivation. Now, not only does he have major aggressive tantrums but once I get him safely restrained he's still got cursing, and started spitting again.