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This paper surveys studies of RCPSPs and RCMPSPs under consideration of four categories of project activities, simply recorded as categories A, B, C, and D. Category A refers to activities can be performed using fixed resources along The Y-axis over fixed durations along The X-axis, and cannot be interrupted | A survey in the resource-constrained project and multi-project scheduling problems Journal of Project Management 5 2020 117 138 Contents lists available at GrowingScience Journal of Project Management homepage www.GrowingScience.com A survey in the resource-constrained project and multi-project scheduling problems Samer Ben Issaa and Yiliu Tua a Schulich School of Engineering Department of Mechanical and Manufacturing Engineering University of Calgary Canada CHRONICLE ABSTRACT Article history Resource-Constrained Project and Multi-Project Scheduling Problems RCPSPs and Received September 20 2019 RCMPSPs have been essential topics of study over the last three decades. Both problems Received in revised format Oc- consist of activities that must be scheduled subject to precedence and resource constraints. tober 2 2019 This paper surveys studies of RCPSPs and RCMPSPs under consideration of four categories Accepted November 14 2019 Available online of project activities simply recorded as categories A B C and D. Category A refers to November 14 2019 activities can be performed using fixed resources along The Y-axis over fixed durations Keywords along The X-axis and cannot be interrupted. Category B applies to activities that can be Project scheduling performed using the same type of resource in category A but can be interrupted. Category C ABCD activity classifications refers to activities that can be performed using flexible resources over flexible durations and Limited resources cannot be interrupted. Category D refers to activities can be performed using flexible re- sources over flexible durations and can be interrupted. Many algorithms have been devel- oped to solve the RCPSPs and RCMPSPs when activities are classified individually under category A B or C. However in practice welding cutting or assembly activities in a man- ufacturing projects for an oil cargo can be under a new category so-called D. The project manager can speed up or slow down these activities
