SMALL GROUPS - FOUNDATION OF THE PITTSBURGH EXPERIMENT - THE PITTSBURGH EXPERIMENT GROUPS ARE OPEN TO EVERYONE. ANYONE IS WELCOME TO ATTEND. THERE ARE MEN, WOMEN AND MIXED GROUPS. THERE IS NO SET NUMBER OF PEOPLE PER GROUP. ANYWHERE FROM 2 TO 12 PEOPLE CAN HAVE A MEANINGFUL SESSION. THE GROUPS USUALLY MEET FOR AN HOUR A WEEK BEFORE OR DURING LUNCH OR IN THE EVENING. SOME GROUPS MEET IN AN OFFICE CONFERENCE ROOM WITH BROWN BAG LUNCHES, OTHERS IN RESTAURANTS. THEY BEGIN ON TIME AND END WHEN PROMISED.