In the simplest possible system, where all you store are files and you store them in a single file system, that file system can act as your index. You create new items by looking at your existing folders and using the next number.
But as soon as you use your system elsewhere — which you should — this breaks down.
Say you have category
17 Risk and you use it to store:
- Your risk register, which is a database.1
- Your risk management plan, which is a Word document.
- Minutes of the latest risk workshop, which are an email thread.
Now we have items across systems, and the problem should be obvious.
When you want to store a risk analysis spreadsheet and need to assign
17.04, how do you know that it’s the next available number?
If you check your file system you’ll think that
17.03 is available and now you’ve used a number twice.
The index solves this, and provides many more benefits.
It’s an index, not an inventory
It’s worth noting that the purpose of this index is not to record the details of every item you save: it is only to record the IDs that you have assigned.
Your index needs to record this level of information:
11 My category
11.01My first ID
11.02My second ID
You don’t need to track what’s in each of your Johnny.Decimal folders:
11 My category
11.01My first ID
11.02My second ID
How to keep your index
The simplest way to keep an index is in a notes app. I’ve tried other solutions, but they were all too ‘heavy’. Your system needs to be frictionless.
I use Bear but any app that allows you to quickly search your notes will work.
There are two methods. I prefer the first.
1: One note per ID
To create a new Johnny.Decimal item, simply create a new note. Other than the title, which is the index entry, the note may be blank.
You must do this before you create a folder in your file system, or your email, or anywhere else. Creating the note is creating the new ID.
To create a new ID, search your notes for the relevant category. Your app should filter all notes to show only those that match. Identify the next available number and create a new note.
Using Bear’s search to narrow our index to category
By including the
. in our search, we (usually) filter out other notes that just include the text ‘17’.
We can see that
17.04 is the next available number, so we create a note and then use that number wherever it is required.
2: One file with all of your IDs
This style of index is more suitable when you might want to programatically query your system. It does work as a manual index but I found it more cumbersome.
Use one note — it’s always
00.00 in my system, which of course needs its own index entry — and record all of your numbers there.
I format mine as shown. Either use a fixed-width font in your notes app, or make it a ‘code block’.
In a future post I will expand on this index-as-single-file format.
Searching for items
When you’re saving all sorts of items in your system, you won’t always remember where they are. Did you save the workshop minutes in your email, or the shared file system?
You might look in the file system, not find anything, and think you didn’t save it. But you know you did!
The whole point of the Johnny.Decimal system is to remove this frustration.
Having a central index allows you to search for items by title, or filter your entire list by area or category. This lets you see, immediately, what you’ve saved.
If your system also tells you where that item is, then all the better. I record the location of each thing in its index note.
More index tips
I do a lot more with my index but this will serve as an introduction. I’ll write a post in the future with more details.
“This sounds like a lot of work…”
A lot of people see the index as an unnecessary burden. I encourage you to try it out: it takes less time than you think it will, and you’ll find ways that it will help you be even more organised.
I believe that the effort and time is worth it.
Non-note index techniques
Given how simple the index is, there are any number of ways you can implement yours.
Some of these are more relevant in shared scenarios. For example, if you collaborate on a project with colleagues.
Airtable (or any other database)
I’ve created a template database which you can use as a starter. You can copy it from here.
Obvious enough — and I don’t think it’s a great solution, to be honest — but you could always store your index in a spreadsheet.
At work: SharePoint lists
If you work for a large organisation, you may be able to ask your IT people to create you a list in SharePoint. This can work very well, and has the advantage of being visible to your entire team.
Anything else? Let me know
If you implemented your index another way, let me know and I’ll post it here.
I still have work to do…
I still have to think about, and document, the best way to do this in a corporate environment.
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