I noticed that many things in pedagogy and in life are based on three items in a model. The key is to balance these essential elements placed in triangles, to think of all them in the same time.

The situation in education most often is based on three elements: there always is a student, a teacher and an institution (a child, a parent and a home/environment?). 

The formulation of Biesta that students learn something, they learn it for a reason, and they learn it from someone (content,purpose and relationships) can be coupled to the three questions that were probably considered for thousands of years but were best brought into our knowledge by Biggs : What, Why , How? According to Biggs these three questions should be aligned. According to my pedagogy teacher in the course last year: “you as a teacher should always consider and you should know the answer to these questions if you are asked at any moment of day or night.”

The teacher and the institution educate the student and when they do this they should consider all three domains in Bloom’s taxonomy: cognitive, affective and psychomotor (knowledge, emotion and action-based).

The Community of Inquire also introduces three essential elements for education called presences: social, cognitive and teaching. We in ONL were experimenting this model a lot. We were the students but by practicing, succeeding and above all, enjoying it we acquired it and are now ready to use it, it will come like a second nature.

Another trio that I always have in my mind due to the nature of my job is sustainability: I need to always balance the economical,social and environmental outcomes of any process.

For the final exam of the pedagogy course last year we were asked to design a teaching activity using references. At that time I found this interesting article that describes three principles for higher education for sustainable development: interdisciplinarity, transdisciplinary and self-regulating learning. I see a connection between this model and the five stages model, created to be used in e-learning course designs. I liked the way scaffolding technique were presented in this video.

And this delightful model also demonstrates that not all good things in life are three

References:
1. Biesta, G. (2009). Good education in an age of measurement: On the need to reconnect with the question of purpose in education. Educational Assessment, Evaluation and Accountability (formerly: Journal of Personnel Evaluation in Education), 21(1), 33-46.
2. Biggs, J. (1999). What the student does: Teaching for enhanced learning. Higher education research & development, 18(1), 57-75.
3. https://en.wikipedia.org/wiki/Community_of_inquiry
4. Steiner, G., & Posch, A. (2006). Higher education for sustainability by means of transdisciplinary case studies: an innovative approach for solving complex, real-world problems. Journal of Cleaner Production, 14(9-11), 877-890.
5. https://youtu.be/4pKsZ6dVhlI
6. Photo: https://pixabay.com/en/network-chopsticks-play-stone-262056/  (Creative Commons CC0)