Referring a friend to PMI’s web site for info on the PMP certification is helpful, but it is not an example of contributing to the project management knowledge base. 1 is incorrect. Giving a lecture is an example of contributing to the project management knowledge base. 2 is incorrect. Writing articles is an example of contributing to the project management knowledge base. 4 is incorrect. Publishing a book on project management methodologies is an example of contributing to the project management knowledge base.