Project Portfolio Selection and Scheduling with Resource Allocation, Synergies, and Project Divisibility

Table 2

Decision variables of the mathematical formulation.

Decision variable	Description	Scope	Nature
	Amount of resources to be allocated to task of project and resource type in the period	,	Continuous
	If the project is selected to be supported and financed		Binary
	If task of project is active or in execution in period		Binary
	If the synergy is active in the period		Binary
	Additional decision variables in order to obtain the variable		Binary
	The first period in which the task in project is active		Integer
	The last period in which the task in project is active		Integer