91. Service and Support ---Post-purchase support. Users should favor vendors that provide superior post-purchase user services such as responsive phone support, quality documentation (online and printed), online user-group discussions and web sites with diagnostic applications. Low-hassle life cycle management. Users should choose vendors with a track record of providing timely, easy-to-install upgrades with reasonable additions of new functionality and few “bugs.. this is most important at? Selection and decision-making criteria for a Distributed Control Systems in the process industry - Results Using Filter: Q3 YES, Q7 DCS end user