Topic

I was originally trying to narrow down what to put in the blank:

Does ___________ influence the effectiveness of charter schools? 

I was thinking of using teacher retention, and there are a few articles out there that address this. But as I did more research, and going along with some of the things I know from looking at charter schools for a separate assignment, this research is largely inconclusive, as is the case with so much of the research out there in general about charter schools. However, there are a few studies that do more of a meta-analysis of which factors influence charter school effectiveness (looking at a variety of primary studies focusing on individual factors). These factors range from funding, oversight, staff/student populations, size, retention etc, etc. I was possibly considering looking at a few different factors, maybe 3-5 of them, and use my thesis to comment on "which of these factors appear to have a significant effect on overall effectiveness and which appear not to have a significant effect." I think this could be more insightful than focusing solely on one factor only to find out by the end of the project that this factor is useless at determining effectiveness of charter school.