The Enneagram is a dynamic personality system that describes nine distinct and fundamentally different patterns of thinking, feeling and behaving. It describes the strengths and challenges of each type as well as its challenges. It's one of the most powerful systems for supporting self-awareness, continual learning and transformation, providing a pathway away from the "box" of our personality into "essence". 

To understand more, download an article Penny has written about the Enneagram here . 

Listening from the Heart of Silence is the second book in this series on Nondual Wisdom and Psychotherapy. It offers 11 chapters in an anthology of writers, therapists and teachers inspired and able to bring people into a more direct relationship with the heart of silence residing within each of us. Penny Fenner's chapter Healing from the Heart: Embodying Nondual Wisdom demonstrates the need for loving-kindness if we are to fully embody and live in harmony with our deepest essence. 

Essential Wisdom Teachings - the way to inner peace
by Peter and Penny Fenner

This book review of Peter Senge et al's book Presence - Human Purpose and the Field of the Future powerfully alludes to the Fenner model which underscores Skilful Action work (paragraphs 13-15).

These links below may be useful in taking your interests further.