I don't know of any calculations (numerically based) that can allow you to analyze a SWOT analysis. The reason is that SWOT is really "objective". So what you see as a weakness may not be a weakness to others. And the analysis isn't a numerically based analysis but rather an objective analysis.
As for setting a Mission, Vision, and Values that depends on your company. If the company is you, use your personal ones (what you want to achieve through the company, where you see it going, and what values you have). If it's an established company, it should have these items already 😉
Honestly, I paid good money to sit through 2 upper-level courses to learn different techniques to analyze SWOT, and I'm not really willing to just tell you. But if you want to learn, go to a business school. They'll teach you. You could also look at the Balanced Scorecard as a measure of your business.
I'll try to be as brief as possible with answers to these:
These are what you/your company do(es) well. If it's manufacturing, sales, customer satisfaction, employee appreciation, whatever. Whatever your business does well.
This is where your company doesn't shine. Maybe your efficiency or productivity level, or costs.
what are gonna be my Opportunities and threats of course ?
The opportunities are external things your business can do to help achieve that mission. Things like acquiring a company, or a new technology.
Threats are external influences that threaten your company from getting it's job done. Things like a declining ".com" boom, or a false sense of insecurity for the internet.
Hope this helps. For a fairly informed overview of SWOT, you can look at the Wikipedia entry.
