what will happen in those cases when one of the parties does not agree with the results of the work done?
In those cases one of the parties starts dispute. Smart-contract refers to the system, system finds among users 3 appropriate arbitrators and they resolve that dispute for 10% of the deal amount. The dispute resolution process is described in detail in https://ico.unolabo.io/tpl/docs/WhitePaperUnlbTokenSale.pdf
The WP can cause a lot of questions
, I'd glad to discuss it here 
.