"SWOT analysis is a simple framework for generating strategic alternatives from a situation analysis."
"SWOT Analysis Limitations
While useful for reducing a large quantity of situational factors into a more manageable profile, the SWOT framework has a tendency to oversimplify the situation by classifying the firm's environmental factors into categories in which they may not always fit. The classification of some factors as strengths or weaknesses, or as opportunities or threats is somewhat arbitrary. For example, a particular company culture can be either a strength or a weakness. A technological change can be a either a threat or an opportunity. Perhaps what is more important than the superficial classification of these factors is the firm's awareness of them and its development of a strategic plan to use them to its advantage."
Mission Statement: "The WTO's stated goal is to improve the welfare of the peoples of its member countries, specifically by lowering trade barriers and providing a platform for negotiation of trade. Its main mission is "to ensure that trade flows as smoothly, predictably and freely as possible". This main mission is further specified in certain core functions serving and safeguarding five fundamental principles, which are the foundation of the multilateral trading system." - Wikepedia
I think you should do some background reading on the WTO itself, particularly its mission statement. Then read up on SWOT and PEST analysis in general (see the links). http://www.netmba.com/strategy/swot/