Organization Structure
AIESEC on a global level is only a 4-layer organization . Looking at AIESEC from a strategic and direction setting angle, the structure looks like this: (If you turn it around you have the structure from an activity angle)

LC: Local Committee
MC: Member Committee
AI: AIESEC International
GP: Global Plenary

AIESEC International (AI)
Based in Rotterdam, Holland, AIESEC International coordinates the work of AIESEC all over the world; this is also where global directions and exchange strategies are formulated. AI consists of the President of AIESEC International (PAI), and a few Vice-Presidents responsible for specific areas. Every year, AI and more than 80 member committees gather in the International Conference, discuss on a number of initiatives that are to be carried out globally.
One thing to note:

YES, they are the ones who may have an international exposure that thrills everyone;
YES, they are the ones who may be working with the most prominent organizations throughout the world (DHL, P&G, PricewaterhouseCoopers, UBS, Cadbury Schweppes and many more, which are all our Global Development Partners)
YES, they are, in fact, doing things that impact the world. But they are just students!

Like any one of YOU.
Member Committee (MC)
Every member country has a national executive board called the Member Committee. They are responsible for coordinating the work of the Local Committees and call for national actions.

Local Committee (LC)
Local Committees are established in universities and higher schools all over the world. In AIESEC, we think globally and act locally, so the LCs are like the operation units which execute AIESEC XP. They provide various learning opportunities for members through local projects and exchange programme.

AIESEC in Hong Kong

AIESEC in Hong Kong is currently composed of a Member Committee and 6 Local

Committees in 6 local universities, namely:
The Chinese University of Hong Kong  (AIESEC-LC-CUHK)
The University of Hong Kong (AIESEC-LC-HKU)
The University of Science and Technology (AIESEC-LC-HKUST)
Hong Kong Baptist University (AIESEC-LC-HKBU)
Lingnan University (AIESEC-LC-Lingnan)
Hong Kong Polytechnic University (AIESEC-LC-PolyU)