Although lexical bundles (LBs) have attracted considerable attention in applied linguistics, their variation by discipline is an under-researched area, particularly with regard to Master's dissertations. This paper explores the frequency, structure, and function of four-word bundles used in Electrical and Electronic Engineering Master's dissertations written in English by Algerian students working in four sub-disciplines -- Power Engineering, Computer Engineering, Telecommunication Engineering and Control Engineering. The LBs extracted from each subdiscipline were subjected to structural and functional analysis, applying Hyland's (2008) framework. The results were compared across the sub-disciplines and between these subdisciplines and Hyland's (2008) findings for Electrical Engineering to indicate the main structural and functional patterns relating to the bundles retrieved. Further, a fine-grained functional analysis was undertaken which goes beyond Hyland's framework to indicate the main realisations of bundles and propose pedagogically-friendly formal-functional 'clusters' of bundles. Potential pedagogical and methodological implications are also discussed.