4. Crossover study design will be used to compare the effect of using the comorbidity-DSS for detection of recommendations interactions and on generation of correct non-conflicting recommendations. Each participant will be given 6 scenarios: 3 will be solved with the aid of the system and 3 without it. Each scenario will be presented to the clinicians as a series of single steps. In DSS-mode the clinicians will be presented with the output of the comorbidity-DSS for each step, including the list of interactions between recommendations originating in the different clinical guidelines and the set of non-conflicting recommendations that fulfill the goals of the relevant decision point/goal. They will need to say for each interaction and for each non-conflicting recommendation whether they accept or reject it, possibly adding some free text; in the non-DSS mode, the clinicians will need to provide their set of detected interactions and proposed non-conflicting recommendations after each step, in free text.