Estelle,
In 4.4.1.5, it is referring to the skills/training/competencies of the people working for the organization. Those skills are assets that can be leveraged to help move a project forward.
By contrast, EEF (Enterprise Environmental Factors) reflect things such as culture or policy or other elements of the environment in which the company exists that can have an impact on the project.
So, for example, if Estelle is an awesome .Net developer, that fact should be noted as an asset to the company (and,hence, the project if it needs a .Net developer).
If the company has a personnel policy that states employees cannot work overtime, that is an Enterprise Environmental Factor that needs to be taken into account when planning the project.
I hope that helps!
Best regards,
Tracy