Within the project "Reference implementation for Open Scientometric Indicators" (ROSI), new assessments and visualizations of conventional and alternative metrics (altmetrics) will be developed and their effect on researchers will be investigated. For this purpose, a reference implementation based on the open source research information system VIVO will be developed in which various metrics are combined with data from different openly licensed sources. In order to develop the requirements of the target groups, surveys are going to be conducted to investigate the effect of scientometric indicators on scientist's and their expectations regarding those indicators. The objectives of the project are firstly to evaluate the scientometric needs and concerns of the target groups, and secondly to implement a usable reference implementation of a toolset that reflects the results of the study and that enables transparent, license-free, flexibly adaptable analysis of the output of researchers, contributors and organisations.