Relatively little is known about how goals in complex jobs are translated into action and how they are completed in real life settings. This study addressed the question to what extent planned work may actually be completed on a daily basis. The completion of daily work goals was studied in a sample of 878 tasks identified by 29 R&D engineers with the help of a daily diary. Multilevel analysis was used to analyse the joint effect of task attributes, perceived job characteristics, and personality attributes on the completion of planned work goals. At the level of task attributes, we found that priority, urgency, and lower importance were related to task completion, and at the individual level, conscientiousness, emotional stability, and time management training. Task completion was not related to task attractiveness, workload, job autonomy, planning, or perceived control of time.