In a similar fashion, you can create a broadly diversified portfolio but choose an activemanagement strategy instead of simply buying and holding to track the major indexes (which is passive management).
Style investing is an activemanagement strategy whereby an investor overweighs their portfolio to growth or value stocks in an attempt to outperform the broad market.
Since a portfolio consists of multiple mutual funds, a portfolio of actively managed funds should be benchmarked to a portfolio of comparable index funds to determine if active fund management is working or hurting.