The bus-factor is a very versatile tool, both as a consultant and as a customer.

Say you are just getting started with cybersecurity in your organization, you need to build a security program but, for lack of adequate candidates, can't recruit easily. You decide to recruit internally:

OK, now what? you need a CISO and you need this team to accumulate some experience, hopefully without enduring too much damage while staying compliant with your contractual and regulatory environment.

That's when I come in. I'm a consultant, I've been doing CISO work for years. I'm not looking for a ten-years stint. I may have convincing arguments, but still I represent a bus factor of 1. If I leave early then you are left holding the bag.

Why commit at all in this situation?

Here's my answer: I'm fully transparent about my objectives, when I come in I am here to build for the long term. That means beyond my own expiration date. To accomplish that I use standards.

At any point in time you will have a full and complete access to a knowledge base with:

This is a well-honed structure that can be easily explored by anyone. Need to replace me with 2 weeks of notice? No problem.

My value isn't in keeping your operational autonomy for myself.