Past IAU and Current IAU
Classifying Before Discovery of Dwarf Planets
The IAU gathered in Prague to discuss what exactly Eris was, and whether the three newly discovered bodies were planets or not. The classifications that they came up with are as followed:
1. Must be in orbit around the Sun
2. Has sufficient mass to form spherical shape
3. Has cleared orbital path
They decided that Pluto, Ceres, and Eris only accomplished the first two points needed to be a planet. The other thousand bodies were known as Small Solar System Bodies (SSSB).
They agreed that these bodies only accomplished the first point needed.