The three Qualities defined in Astrology are, after the Elements, the second major classification that defines the nature of the Signs.
The Qualities assign the Signs into Quadruplicities, groups of four Signs each that reflect the three common modes of Signs.
Signs that are 90 degrees apart or opposite each other — 180 degrees, also known as Signs in Polarity — have the same Quality.
The Signs that belong to the same Quality generally do not function smoothly together, despite their likeness — or perhaps because of them.
They are often uneasy with one another, but those in polarity complement each other, even though tension sometimes exists between them.
Within an astrological chart, the Quality describes a person’s attitudes in life and the way they approach projects.
The three Qualities are Cardinal, Fixed and Mutable.

The Cardinal Signs are Aries, Cancer, Libra and Capricorn.

These four Signs are the initiators of the Zodiac.
Their common characteristics include action and drive; they have initiative and strong motivation.
On a team, Cardinal Signs are the people who come up with ideas and get the project moving, but they are not very good at completion and follow-through.
The Cardinal Houses are the First, Fourth, Seventh and Tenth; if a chart has a number of Planets in these Houses, the chart is weighted toward Cardinal energy.

The Fixed Signs are Taurus, Leo, Scorpio and Aquarius .

These four Signs are the members of the Zodiac who dedicate themselves to seeing projects through to completion.
Their common characteristics include determination and persistence; they are stable and self-reliant.
On a team, Fixed Signs are the people who keep a project going and see it through to the end, but they can also be stubborn and inflexible.
The Fixed Houses are Second, Fifth, Eighth and Eleventh; if a chart has a number of Planets in these Houses, the chart is weighted toward Fixed energy.

The Mutable Signs are Gemini, Virgo, Sagittarius and Pisces .

These four Signs are the flexible members of the Zodiac, happy to fill an assigned role.
Their common characteristics include adaptability and changeability; they are flexible and versatile.
On a team, Mutable Signs adapt easily to changing conditions, and they don’t have a particular agenda.
They can, however, be wishy-washy or inconsistent.
The Mutable Houses are Third, Sixth, Ninth and Twelfth; if a chart has a number of Planets in these Houses, the chart is weighted toward Mutable energy.
Many people don’t realize how important the Elements and Qualities are in true Astrology.
It’s the combination of Elements and Qualities that makes the Signs what they are; they combine in twelve distinct ways, one for each Sign.

A Mutable Quality is attached to the Signs Gemini, Virgo, Sagittarius and Pisces.

The Mutable Houses are the Third, Sixth, Ninth and Twelfth; if a horoscope shows a preponderance of Planets in these Houses, its energy is weighted toward mutability.
Mutable Signs know how to go with the flow.
They are adaptable and flexible and can change their form of expression to whatever a situation requires.
Standing their ground is of little import to Mutable folks.
These people would much rather conform to the norm, so long as their doing so will help the greater good.
Luckily, Mutable individuals are versatile and find it quite easy to change.
Consider them the chameleons of the Zodiac, since they can take on varied personae.
Mutable people are blessed with a tremendous resourcefulness.
Talk about making lemonade out of lemons!
They know how to squeeze that last drop of juice and make things better in the process.
Those influenced by a Mutable Quality in their horoscope also enjoy learning, play fair and are diplomatic and well-liked by others.
To their further credit, they are sharp, sympathetic and can see (via a sixth sense?) the essential elements of a situation.
At times, however, their desire to please everyone can get them into hot water.
They may come across as wishy-washy, inconsistent and downright duplicitous.
All this in the name of aiming to please!
The beauty of mutability is that those possessing it are flexible, versatile and highly resourceful.
These folks are quick to help others and are selfless in the process.
While they may occasionally stretch themselves to the breaking point, they know how to bounce back.