Organizations have to improve their processes continuously for being able to keep with the increasing competition. In recent years, more and more collections of best practices were designed to assist companies in improving their processes. We call these collections improvement instruments. These can vary in several points: complexity, detail, domain etc. Some are designed for one or more domains, some are more general. Some provide guidelines for processes but they do not provide specific instructions or methods. However the collection of improvement instruments is not transparent enough and hard to compare. Although there is information about each single instrument and there are some comparisons between two such instruments, there is no integrated solution that makes a collection of improvement instruments more transparent.