Here is the GMH Planning detailed guide as to the most important changes within the new NEC4 version of Engineering and Construction Short Contract. If you are fairly familiar with the NEC3 version then you will find this guide a very useful summary as to what you need to know is different 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