Sample: Target of the intervention are managers of the care units within the NHs. To avoid contamination effects, randomization will be done at the facility level, with all included unit managers of the same facility receiving the same feedback intervention. To determine sample size a computer simulation-based sample size approach was adapted that accounted for multiple repeated measures in three study arms, and the complex nested structure (time points nested within each care unit, and units clustered within facilities). Power and sample size were estimated based on a mixed-effects regression model. Using data from the previous phase of TREC (2007-2012) the required parameters to be entered into the model were estimated. Assumptions were that SF will increase the primary outcome (Formal Interactions [FI] score) by 0.2, BAF will increase the FI score by 0.4, and EAF will increase the FI score by 0.6. With an assumed power of 0.90, a significance level of 0.05 and an attrition rate of 25%, a total of 144 care units will be needed (48 NHs with an average number of three units or 72 NHs with an average number of two units).