There isn't a "seven step system" for classifying living organisms. The current widely accepted system uses a hierarchical system with eight major taxonomic ranks:

1. Domain (the broadest category)

2. Kingdom

3. Phylum (or Division for plants)

4. Class

5. Order

6. Family

7. Genus

8. Species (the most specific category)

This system, called Linnaean taxonomy, was developed by Carl Linnaeus in the 18th century. It's a hierarchical system, meaning each level is nested within the one above it. For example, all species within a genus belong to the same family, and all families within an order belong to the same class, and so on.

Example:

* Domain: Eukarya

* Kingdom: Animalia

* Phylum: Chordata

* Class: Mammalia

* Order: Primates

* Family: Hominidae

* Genus: Homo

* Species: Homo sapiens (humans)

This system is constantly being updated and refined as new discoveries are made and our understanding of evolutionary relationships improves.

Note: Some resources might mention a seven-step system by excluding the "Domain" level. However, the inclusion of Domain as the broadest level is currently the most widely accepted approach in modern classification.