A term used to describe a particular transition strategy for becoming a one-to-one enterprise. The picket-fence strategy is based on isolating all or most of your Most Valuable Customers and your Most Growable Customers from the traditional marketing initiatives that the rest of the customer base is subjected to, and over time expanding the population of customers "behind the picket fence."

Wooden fence comprised of pointed slats, which are attached to horizontal rails.

Disambiguation: you may be looking for Picket Fences or picket fencing