Methods, apparatuses and computer programs for making information relating to web services available to applications hosted by a client platform and/or using such information to invoke web services for use by an application hosted by a client platform are disclosed. The information is preferably obtained from a local repository or otherwise from a remote repository via the internet. The information may relate to web services previously used by the applications such as particular invocation instances of those web services. The information may comprise statistical Quality of Service (QoS) information relating to particular invocation instances of web services.