One of the first necessary steps to take by national authorities is to approve workshops which tasks are to install, activate, calibrate, repair, exchange, download and decommission digital tachographs. The documents available in this section provide the detailed instructions on how to do it properly. Furthermore, they address how to establish security measures at workshops and offer some further explanations about the test tools they should use as well as information on how to activate, calibrate and decommission a tachograph.