Approve your new brand on an invoice, not a billboard
It is natural to judge a new brand identity the way it is presented: a logo on a shopfront, a tote bag, a billboard at dusk. The assumption is that if it works there, it works everywhere. That assumption breaks down on an ordinary Tuesday. Someone opens Word to send a quote, the custom font is missing, the logo turns to mush in an email signature, and the result looks nothing like what you approved. So test the identity on your dullest documents before you sign off.
Why aren't the mockups enough?
Mockups are built to flatter. They show the logo large, with plenty of space, in perfect light and full colour. Much of your brand will be seen somewhere far less forgiving: a small profile picture, a PDF opened on a phone, or a black-and-white quote from the office printer. Fine lines and subtle colour shifts that look elegant on a billboard can blur at small sizes or vanish in greyscale.
Which documents should I test it on?
Pick three from your real working week: the document you send most often, the one your most valuable customers see, and the one made by the least design-confident person on your team. For a hypothetical accountancy practice, that might be an invoice, a proposal cover and a client letter. Ask your designer to show the identity on those three, built in the software your team actually uses. It is a fair request, because guidelines and everyday collateral belong in any proper brand identity project.
What should I look for?
Ask three questions of each test. Does the logo still read at small sizes and in one colour? Is the typeface installed on everyone's laptop, or will Word and PowerPoint swap in a default font once the file is shared? Could a non-designer rebuild the layout from the guidelines, or does it only work when a designer arranges it? Any "no" is far easier to fix before launch, with a simplified logo, a backup system font or a ready-made template. After launch, the problem shows up in every quote and letter you send. Book the test before you book the printer.