Zweig’s strategy for identifying and investing in companies mainly consisted of shortlisting companies with strong growth in earnings and sales, a reasonable price-earnings ratio given the company’s growth rate, buying by insiders (or at least an absence of heavy insider selling), and relatively strong price action. The screener entails screening publicly available data on a number of stocks using predetermined criteria. This enables individuals to follow a large number of stocks at one time, spending a limited amount of time on any one company.