What is the difference between a time-constrained project and a resource-constrained project?

The TCPSP is a variant on the well studied RCPSP (Resource-Constrained Project Scheduling Problem). However, there are fundamental differences between the timeconstrained and the resource-constrained variant. In the TCPSP, the deadlines are strict and resource capacity pro- files can be changed, whereas in the RCPSP, the given resource availability cannot be exceeded and the objective is to minimize the makespan. Moreover, in the TCPSP a nonregular objective function is considered. Therefore, the existing solution techniques of the RCPSP are not suitable for the TCPSP