Commendable Efforts

Business Letter

Dear …

RE:  __(Name of Project/Program)__

I want to take this opportunity to congratulate __(name of department)__ for a first-rate job done in designing the __(type project/program)__.  The commitment each team member exhibited with their individual contributions to __(this project/program name)__ was quite impressive.  Each one of them proved to be exceptionally accommodating on this __(case/project/etc)__, willing to help in anyway to expedite the process. 

The overall dedication demonstrated by your team resulted in __(project/program)__ design that is nothing short of excellence in quality.  I commend all of you for an outstanding job.  Well done!