Have you ever been at the wrong end of a limiting assumption? That is, has someone believed something about you that's simply not true - and persisted in believing it, all evidence to the contrary notwithstanding? It could be something fairly innocuous -- your uncle's mistaken belief that you're interested in hearing about fly fishing -- or something much more problematic: your boss doesn't give you responsibility for taking on larger client projects because she assumes you're not capable, even though you've demonstrated your capability many times.
I've come to believe that most of us hold a variety of limiting assumptions, and that doing so can really get in the way of our success. And, if we hold them about the people who work for and with us, get in the way of their success as well.
What is an assumption, anyway? Here's one definition: "Something taken for granted or accepted as true without proof; a supposition." Assumptions are a necessary part of life; if we couldn’t take for granted that some things are true, it would be hard to operate. For example, in the first few minutes after we get up each morning, we make dozens of assumptions that allow us to start our day: that our alarm will work, that our clothes will be in the closet, that the bathroom will be in the same place it was last night, that the sun will rise, that our toothpaste won’t be poisonous, etc. etc. All of these are valid assumptions: we have lots of data to back them up, and not having to think about or question them allows us to move through our day.
But because assumptions are so essential to our continued functioning, we tend to over-extend our assumption-creating capacity into areas where we have much less data. We do it to make sense of our lives and to keep from being overwhelmed by choices – but it often results in holding onto a limiting and inaccurate assumption that doesn’t serve us. And we tend to believe these untested assumptions just as firmly as we do the sun-will-rise variety.
For instance, let’s say you have a new employee who shares some sensitive information with a client. She didn’t know it was confidential; she apologizes. Then a couple of months later it happens again, with a different client and different information. The employee is mortified: she apologizes, makes it her business to get very clear on what should and shouldn’t be shared. Now a couple of years have gone by, and there’s never been another problem. In fact, the employee is more conscientious than her colleagues about discretion and confidentiality, based on her early experiences.
But all too often, that employee will still have a reputation as being someone who’s “not discreet” or who “can’t be trusted with confidential information.” That kind of limiting assumption can derail a career – and it can keep you from taking advantage of your employees’ potential.

How can you shift your limiting assumptions about your employees or team mates? Question them. Here’s a quick primer (you can get a more in-depth look at this approach in chapter 5 of my book):
1) Recognize your existing assumption: For instance, you notice that you’re thinking, “This employee can’t be trusted with confidential information.”
2) Question it: Shift from ‘taken for granted as true’ to curiosity; “Can this employee be trusted with confidential information?”
3) Gather new data: Ask others, observe – get more information about whether or not this belief is accurate. In this case, you might find that, except for those two early instances, this employee has never breached a confidence, and others see her as being very trustworthy
4) Test the data: You might test your new data by sharing some moderately sensitive information with the employee, making it very clear to her that it’s confidential, and see what happens.
5) Revise or re-confirm your initial assumption: Based on your tests (I’d advise you to do more than one) you can make a new and more informed assumption.
You may be surprised to discover how often your assumptions are unnecessarily negative or limiting. Updating them may free you and others to take on new challenges and succeed in new ways. Try it and let me know what happens.