The problem is the number of fields. Usability shows the relation between number of fields x conversions follows a power law [1]. Aiming at 80% conversion, the

The problem is the number of fields. Usability shows the relation between number of fields x conversions follows a power law [1]. Aiming at 80% conversion, the threshold is between 3-7 fields. [1] http://en.wikipedia.org/wiki/Power_law http://en.wikipedia.org/wiki/Power_law