This paper proposes a mash-up development methodology for Higher Education (HE) and libraries. The fast-paced development of mash-up editors has created a wealth of features and approaches that users can take advantage of. Meanwhile, there has been insufficient work on the creation of a mash-up development methodology that would serve as a guide to Higher Education and library mash-up developers. The first part of our study focuses on investigating mash-ups, mainly from university and library user perspectives. The second part focuses on plans to formulate a mash-up application methodology for using information mash-up editors to develop business mash-ups. This part has evolved during our work in creating experimental mash-ups at University Technology PETRONAS (UTP). Initially, the research considered a large number of candidate mash-up editors, two of which were selected. As the research progressed, the mash-up development methodology took shape in an incremental manner until it reached its final form. The work can hopefully be used to guide both researchers and Higher Education and library users in developing mash-ups. © 2010 IEEE.