Screens are the simplest form of portfolio management.
You can create a screen for pretty much anything.
With RAAMPS we start by screening and focusing on a specific fundamental or tendency. For example, in our Ultra Growth portfolio, we screen for not only Growth stocks but three different types of growth (fundamental, accelerating, and growth at a reasonable price or GARP). We have found that during market rotation a particular type of growth may fall out of favor so we would sell it while another type may show growth and we would buy into that particular type of growth. However, we have found that screening alone offers little protection or alpha. It does, however, create a symbolic balance by allowing base portfolios to focus on different elements. Which allows for optimization of performance in the latter steps.