I recommend the System Dynamics Methods to you all as I find that it's kind of methodology for thinking and especiall helpful to product/project management as well as team running. It's Chinese version named as "系统思考" or "系统动力学" and is also a prevailing book you could find that in almost every bookstore. You could get more information from following link in where the basic knowledage could be found: http://www.public.asu.edu/~kirkwood/sysdyn/SDIntro/SDIntro.htm There is also a software could be made use of as a tool assisting you proceed on business: Vensim.
I strongly recommend you read english version because I found that the Chinese translation is so ugly and difficult to understand. Sometimes, the translator misunderstood original meaning because he/she is not professional in the field.
For marketing, there is a interesting game named as "Beer game" based on System dynimics method. You could play with your team members.