Here is the GMH Planning detailed guide as to the most important changes within the new NEC4 version of the Professional Services Contract. For those who are pretty familiar with the NEC3 version then you should find this document very useful to understand what the main changes are that have come about within NEC4.
Each of these guides have now all been colour coded so that for each change identified it is split into one of five categories for easy reference: 1) new NEC4 clause, 2) new point of clarity, 3)Change to previous wording, 4) Same clause re-numbered, 5) Deleted NEC3 clause