I found his key-word-system easily applicable to chart interpretations so I thought I'd share it with you.
All credit obviously goes to Stephen Arroyo himself; praise that man - his book was awesome.
Furthermore, the element of the ruling sign is important in classifying the houses, as well.
The first house is ruled by Aries, which is a cardinal fire sign
The second house is ruled by Taurus, which is a fixed earth sign
By looking at the quality and element of the ruling sign, you can describe the houses with these keywords:
Air: Social & Intellectual
Water: Soul & Emotional
By combining these keywords, you get the following themes for the twelve houses:
Ruled by Aries (cardinal fire sign)
-> Angular fire house : Action of Identity
Social and Intellectual Learning
Action on the Emotional and Soul Level
Security of Identity
Learning through Material experiences
Action on the Social and Intellectal Level
Emotional Security and Soul Security
Learning about one's Identity
Action in the Material world
Security on a Social and Intellectual Level
Learning on the Emotional and Soul Level