Although these three concepts are inseparable, we have to start somewhere, so let's look first at your business identity. This is what makes your business different from all others. What you want, what you do well, how you do things, what makes you unique.
What you want to do with your core strategy is establish that identity for yourself, your team, and out there in the market, for your customers.
You have to understand what you do and who you are if you are going to be able to set your business apart from its competition. The exercise is something like looking at a mirror. Gather your team together, if you have a team ready, because this makes for a good discussion. Ask some of these questions: 
Presumably, in whatever business you have or whatever business you're starting, you do something you want to do and believe in. Your team members have to want to do it and believe in it too. That restaurant that is somebody's lifetime dream, or skiing equipment, or a newsletter … success isn’t based on the idea, it is based on how hard you've worked at it, how much value you deliver.
In the Art of the Start, Guy Kawasaki offers a list of ways to generate new business ideas. Kawasaki talks about getting going, about ideas being generated by impulses like “I want one” and “I can do this better” or “My employer wouldn’t (or couldn’t) do this.” There too, it doesn’t come out of the blue, it starts with you.
In Growing a Business, Paul Hawken shows how a business grows naturally out of the owners and founders doing something they want to do, filling a need they believe should be filled. I recommend reading that book also.
To be fair, there are exceptions. Franchise businesses, for example, when they work, are a business formula you pay for and implement, while being guided and taken by the hand every step of the way. Being a McDonald’s franchisee means you’re a millionaire; it doesn’t mean you like eating or preparing what McDonald’s restaurants serve. You buy a business to run. The franchisor tells you how to run it. If it isn’t a set formula and if the franchisor doesn’t give you all you need to know, then it’s a bad deal.
To determine your core competencies, take another look at the mirror. Take a step away from the business, and get a new fresh look at it. What things do you do best? Let's consider a few companies most people know: We might reasonably think a core competency of Apple Computer is design, a core competency of Nordstrom is customer service, and a core competency of Volvo is vehicle safety. The picture here illustrates this idea: you have to recognize what you're good at. It can't be everything. You aren't credible if you try to do everything right.
You do have to understand your core competence as you develop your core strategy. Don't pretend you can be the best at service and have the lowest prices and the highest quality products; that isn't credible and it will just get in the way. Be honest with yourself or with your team.
Don't think that core competency depend on the industry, or that they are the same for all players in any given industry. Look at the difference between economy cars, reliability cars, safety cars, and performance cars, for example. Or consider the different possibilities for a management consultant, whose core competencies might be any of these:
And then consider the variations on food services and restaurants. To name just a few:
So this is not a difficult concept to understand. It usually leads to good discussion and a better sense of core strategy.
The fundamental shortcoming of most mission statements is that everyone expects them to be highfalutin and all-encompassing. The result is a long, boring, commonplace, and pointless joke.
In The Mission Statement Book, Jeffrey Abrams provides 301 examples of mission statements that demonstrate that companies are all writing the same mediocre stuff. To wit, this is a partial list of the frequency with which mission statements in Abrams's sample contained the same words:
Fortune (or Forbes, in my case) favors the bold, so I'll give you some advice that will make life easy for you: Postpone writing your mission statement. You can come up with it later when you're successful and have lots of time and money to waste. (If you're not successful, it won't matter that you didn't develop one.)
Make Meaning : The Art of the Start
[see-also]How to Write a Mission Statement (Video) »[/see-also]
Like the artist squinting to view the landscape better, or differently, as you build your sense of business identity, try to focus on keys to success. Keep it to just two or three key priorities that make the difference.
Some of this will depend on your industry, but there's a lot more to it than that. For food services, for example, you might think good food would be an obvious one, but what about a good location, easy drive-through, good parking, or even a proper match between price and reputation. Or marketing? Or the personality of the maitre d'? 
In a retail business, for example, the classic joke is that the keys to success are location, location, and location. In truth, that might be, location, convenient parking, and low prices. It's different depending on your real identity, who you are as a business, and what your strategy is. A computer store's keys to success might be knowledgeable salespeople, major brands, and newspaper advertising.
This idea is related to core competence, but it isn't exactly the same thing. You hope you have core competencies that match your keys to success, but making that happen is a matter of working over time to build the business.
SWOT stands for Strengths, Weaknesses, Opportunities, and Threats. I particularly like the SWOT analysis because it's easy to understand and very quickly gets a team involved in strategic thinking.
Notice that there's a big difference between the first two and last two components. Strengths and weaknesses are internal. They are part of your company identity. You can change them over time, but not easily; you have to work on it. Opportunities and threats are external. They are out there in the market, happening, whether you like it or not. You can't change them.
Especially when you're growing an existing business, you want the planning process to pull your team together, to develop commitment and accountability. Managers have to believe in a plan to implement it. They also have to believe that results will be tracked and that managers will be held accountable for disappointing results and will be given credit for positive results. Healthy planning process depends on everybody believing that results will make a difference. As an owner or operator of an existing business, recognize this team factor as a vital part of your planning process. Work on bringing the team into the planning at several levels.
During my 20+ years as a business plan consultant and 10+ more years running a company, I've seen many times how the SWOT is an icebreaker. It invites people to contribute. It gets people thinking strategically, talking, sharing, and it turns a group of people into a team.
The SWOT also offers a good forum for opening up discussion. I've seen a SWOT discussion bring up problems that needed upper-management attention but might otherwise have remained hidden. Middle managers don't always like telling upper managers what's wrong. Even in a healthy company culture, that can be awkward. SWOT makes that easier.
For example, I once saw a 30-year-old software development manager suggest during a SWOT meeting that one company weakness was that the 50-year-old president kept messing with the software code instead of leaving it to the full-time pros. I saw another SWOT meeting in which several managers said ownership was unwilling to hold managers accountable for underperforming.
It's not magic. It's just an easy-to-understand framework that invites anybody who cares about a business to contribute.
Of course you have to manage a SWOT meeting well. Like any other meeting subject, SWOT can degenerate into useless discussion. A SWOT meeting should focus on the SWOT agenda and avoid unrelated side discussions. It should invite contributions without reprisals for negative comments. It's a variation on brainstorming, so contributions—as in suggested bullet points, suggested items on the list—are all positive as long as they are well intentioned.
If you accept all comments, good and bad, you also get the benefit of bringing people into the discussion. Implementation is much more likely when managers contribute to the plan. They understand the background and they feel like the plan reflects their input. So use the SWOT both ways—use it to catalyze team commitment and to develop strategy.
SWOT Analysis is adapted from Hurdle: the Book on Business Planning
