T-Shaped Influence
The foundation of influence is your network of relationships in the organization. Effective influence is best when your relationships are both focused and wide.
Wide influence covers a larger group at a less personal level. While you have relationships and reputation in that group, you may not have a known track record or tight connections. For influencing organizations, that means that you’ve got contacts, conversations, and awareness across the org chart. Wide influence also gives you the awareness to make multi-disciplinary connections, a key source for innovation.
Focused influence is narrower, concentrated relationships with key individuals. That might be in the executive suite, or in marketing, in R&D or in all three. Focused influence is something that happens more in small groups and especially one-on-one. It takes time to cultivate. It grows from shared experiences, shared successes (ands sometimes shared failures), and shared values and vision. That doesn’t mean that people in your focused influence core always agree with you. But they do know and respect you. Make sure you respect them too, because this kind of confidence is easy to lose if you take them for granted.
Combining both wide and focused influence gives you the breadth to know how your influence efforts relate to the rest of the organization combined with the deep foundation of trust and support that helps you move forwards.
As you move forwards, you can build the track record and one-on-one with individuals in your wide network that shifts them to your focused core of colleagues. That gives you the opportunity to expand the size of your T, both in depth and in breadth. In turn, a bigger T gives you a stronger platform for affecting decisions and outcomes in the organization.
This T-Shaped approach operates at many different scales - you might be operating across the entire org chart, with depth in one key business area. Or you might be working with a small group, like a committee, and have depth with one or two key people.
Either way, the T-Shaped approach can help us build the base for future influence efforts.
Takeaway
Ask yourself: Do I have wider or more focused influence relationships right now? If you have a wider base, take time to cultivate more one-on-one relationships. And if you’re already tight with key players, but don’t know what’s happening on the next floor, take a walk, and start to make connections across the organization.

You should credit IDEO.
Diego, I’m not sure why I should credit IDEO, maybe you’d care to explain further? I’ve never seen a reference to the T-shape for influence or networks before and would be happy to see other people’s thinking about that.
If you’re talking about T-shaped people (which I’ve posted about here before*), then that that honor goes to David Guest, who published the term in 1991, the year IDEO was founded, and long before Tim Brown started using the term. I personally heard the term first in IBM recruiting stuff around 2000, and I first heard Tim Brown talk about the concept in 2005 at Rotman (update: where he clearly had been thinking about it for a while, but not the past 15 years).
* http://www.bplusd.org/2006/04/26/the-t-shape-mindset-and-skillset-is-fractal/
I love IDEO, but I sigh when people think that they originated terms like 5 Whys, T-Shaped People, or Design Thinking.
Agree like Design Thinking, IDEO are simply evangelising it but not originators. Not a bad thing if its all positive.
@BC
You’re absolutely right - IDEO does a great job in evangelizing these ideas. In the T-Shape case, Tim Brown talked about how he came up with the idea himself, and then discovered that others had been talking about it long before him.