In response to Johanna's question:
Johanna asks: How often do you recommend running the screening process to rebalance?
You may be asking one of two things here, so here are two different answers: I think fund evaulation should be done monthly, if for no other reason than to see how your funds are faring relative to one another. If in the middle of the quarter you see a fund that had previously scored well is suddenly falling, you may not want to rush to sell, but do have the knoweldge that it's something you might want to watch over the next few months. If you're using your screening process to develop a buy/sell list, once a quarter is probably often enough to generate the list, but you should review fund relative performance on a monthly basis.
Now, if you're asking about how often you should rebalance a portfolio, I would suggest reviewing portfolios once a quarter. That doesn't necessarily mean rebalancing them that often but review them that often. Only rebalance at the end of quarter when at least on postition has strayed more than 5% from your target for that category. Smaller moves may be offset in the coming quarter, so not rebalancing when there are relatively small moves can save your client both taxes and transaction costs.