No one can accurately predict what might happen downhole all the time.  That's why we often dispatch a complete mobile workshop to support our downhole tool assemblies.  For complex jobs, this TTS capability can be invaluable.  Experienced TTS personnel can change-out entire BHAs, quickly redress tools between runs, or add components to modify job procedures on the fly.  And whenever we can save time, you save money by getting your well back on-stream faster.