New Discipline Method

On Friday, I went to my son's school to observe his class and talk to the school social worker. I explained that we were having trouble with discipline in that the usual methods have not been working. She explained to me that saying no running, no hitting, etc. are ineffective for learning disabled children because everyone must first picture the original item before picturing "no item", and most of these kids just don't make it that far. Also, with cause and effect such as time outs or taking toys away or leaving locations because of poor behavior don't always work because these kids just don't make the connection. So, she suggested continuing with some of our methods, such as leaving a fun location if my son doesn't behave, taking toys away if they're used for unacceptable actions like throwing them at his sister, etc. However, she said that for everything else, just try to phrase everything in a positive manner. By positive, I don't mean, "I'll give you flowers if you're a good boy," or something like that. She meant just not saying no, and trying to think of some other command for him to follow. For example, saying "walk" instead of "no running", "quiet hands" instead of "no hit", "feet on floor" instead of "no climbing", etc. This is extremely difficult. But, we're working on it. Also, whenever he hits his sister, instead of admonishing him, we take his sister away and give her ALLLL the attention, so that he HOPEFULLY will stop using her for getting attention. So, we'll see how it goes.