Techniques enabling decision makers to identify a set ofnon-mutually exclusive projects (or alternatives) constituting a portfolio, while allowing for imprecise information with respect to projects’ benefits, costs, andoverall resource constraints, have emerged as an areaof great applicability. To reach applicability, reasonable and computationally meaningful decision evaluation methods are needed. In this paper, we propose anembedded form of sensitivity analysis for portfolio interval decision analysis building upon the concept of interval contraction. Both a priori sensitivity analysis anda posteriori sensitivity analysis for portfolio interval decision analysis are supported by the approach.