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So far, only few in-depth studies focused on the direct comparison of process models in general, and between plan-driven and incremental/agile approaches in particular. That is, it is not made explicit what the effect is of moving from one model to another model. Furthermore, there is limited evidence on advantages and issues encountered in agile software development, this is specifically true in the context of large-scale development. The objective of the paper is to investigate how the perception of bottlenecks, unnecessary work, and rework (from hereon referred to as issues) changes when migrating from a plan-driven to an incremental software development approach with agile practices (flexible product backlog, face-to-face interaction, and frequent integration), and how commonly perceived these practices are across different systems and development roles. The context in which the objective should …