In most cases, I would say:

Yes, when writing a Service Design Principle, reveal your opinions.

Sharing also your personal opinions has a few benefits:

• It helps you better understand what you think

• If you share your principles, people can react to them, and through the conversation, maybe your opinions will change and evolve

• Opinions make the reading of principles a more human experience. It feels more like a conversation than an academic paper.

There are two cases where you might have to counter balance your opinions more strongly when writing a Service Design Principles:

• If you're taking an academic approach

• If you're writing these principles within a larger organization

Inspired by a community question

Thanks to Ramya Mahendran, who inspired this text by sharing a bit of her own writing journey.