[en] Presentation by Prof. Tom Mens (University of Mons) about the relation between, and guidelines for increasing, the internal and external technical debt and technical health of software. This talk was presented at the Business and Technology Club of the Infopole Cluster TIC in Gosselies (Belgium) on 19 February 2019. The ideas presented are partly based on research conducted in the context of the FRNS-FWO co-financed 'Excellence of Science' Research Project SECO-ASSIST (http://secoassist.github.io)