How does a Service Design Principle library look like? Another interesting question that we can explore. It can be as simple, exactly as simple as this, as your phone photo app. So when I started to collect Service Design Principles, I just had it on, I just took photos and put them on a special folder on my phone.

I went through them and I, Oh, I remember this experience. It was interesting. That, that was something I learned this from that, and because you have the image, it helps your memory go back in time. And one lovely thing is if the image isn't just working for yourself, make a short video.

30 seconds of clicking record and showing it around and say, Hey, what I want to remember here is this, and say a few words, and now you have a recording, you have an archive from what you have learned. This is like the simplest way that you can do a Service Design Principle Library. But it can look also more nerdy and complex, obviously.

That's... How it looks on my side today when I'm writing service design principles, it looks a bit more complex. I'm using a tool called Notion, which is a bit of a bigger thing, where I see every principle and where it is in the writing stage. Is it just an early idea? Is it something where I have only a few notes on it?

Is it something that I do one time, two times, three times, that's like a very professional tool now for me. But it could be also very simple like we just saw before. Or it could be something lovely and inspiring like this template that I built which is much more visual, which has inspiring quotes in it and which is something that you say, okay, cool.

Now with that. Just opening it, it feels already inspired. And one lovely thing that is in this tool is that what on the bottom right is this Featured to resurface resurface past learning. What, if you use that that tool for a long time, it will show you, hey, one year ago, you wrote a principle that was called this.

This might be interesting for you today, maybe. Or one month ago, you wrote this to the present, past memory, past experiences that might be useful. So this is another way to do it. But the one thing that is important is not how does it look, which tool do you use, but more does it help you to search in it on the moment you will use it.

Because once you write something, usually it's not on that moment that you need that. Tip! Ah, you made a lot of observations in the grocery store, but you're not yet working on a grocery store project. But it's still interesting, so you keep it. But in a few years, you might work on a grocery store project, and then you need to be able to go back and find that information.

Use a tool or a system that helps you search very easily. If it's your photos app, cool, because your photo app has information like location, or now, today. These apps are pretty smart and if you write dog it finds all the dogs in your photos, so that's quite a useful tool. If you use a note taking app, you can use tags and text to search it.

So just use a tool that has a search function in some way or another so that you can retrieve this information in future.