Cliques - these were the 'it' girls, interested only in fashion, make-up and hair. They have grown into the 'yummy mummies', obsessed with designer labels and going to the gym. They collect their children in their 4x4's which are more about 'showing off' than navigating the rough terrain of the school car park.
Geeks - the 'goody two shoes' who always handed in their homework on time and were always dressed in impeccable school uniform. They have grown into the 'working mums' juggling careers and families with the efficiency they developed whilst acquiring ten O levels and four A levels. They collect their children (when they can) in their sensible, economical small cars.
Freaks (sorry, but it rhymed) - the social misfits who suffered with bad hair and ill-fitting uniform. They have grown into the 'earth mothers'. Unconcerned with their appearance, they have developed more confidence and a greater purpose in life. They collect their children by bicycle or on foot.
So there you have working mum's guide to playground anthropology.
Can you guess which one is me?