Using your numbers*
Read it out loud
You'll be amazed at how useful this is. How often do you need to tell someone where a file is? That person might be sitting next to you, on the other end of a conference call, or in a Slack channel. Before, you had to describe a file path. Now, you just tell them the number: “eighteen oh-four”, or “sixty-one dot twelve”. So easy.
As part of the filename
When saving files, put the Johnny.Decimal number at the beginning, e.g. 12.03 Payroll schedule 2016.pdf.
This is helpful if you're emailing files: you send the Johnny.Decimal number with the document. It allows you to glance at the title of an open document and immediately see what it relates to.
In meeting invitations
At work, I put the number in [square brackets] at the end of my meeting invitations. For example, Weekly vendor account meeting [62.11]. I put it in square brackets at the end so that it's still readable for people who don't understand or care what my numbers mean.
When I distribute the meeting minutes I right-click the invitation and ‘Send email to all attendees’, which uses the title of the meeting as the subject of the email. Now, my attendees and I can easily find the meeting minutes by searching our email for [62.11].
Stick it to things
If your work involves keeping track of many similar items—say you build laptops for your users—write the number on a sticky note and attach it to the item.
In the subject line of an email
I talked about this on the Example // Fix your email page, so I won't repeat myself. You should read that if you haven't already.
Display it on printed copies
Rather than including the complete (and always ugly) file path on printed documentation, just add the Johnny.Decimal number. Please don't ever type
c:\Documents and Settings\Geoff\MyDocu~1\Files\Reports\2016\Financial\Word docs\Report.doc in the footer of a Word document ever again. Please for the love of all that is good in the world, stop that.