Abstract: The Strategy to Task Technique (STT) is an approach used to develop low-level, often system-specific, requirements for a system or capability through a process of decomposition. The paper describes the use of STT as an enabling analytical tool to support technology investment decisions. The Strategy to Task technique was used to establish relative priorities for a number of defence system categories. These priorities were then used in a subsequent analysis to evaluate the relative contribution of a number of technology programmes to these defence system categories; the aim was to establish investment priorities for these technology programmes. Two Strategy to Task analyses were completed; one analysis used UK military doctrine material and sources, the other analysis used a UK military task list hierarchy. These analyses produced two independent sets of relative priorities associated with the defence system categories. There was reasonable consistency between these two sets of priorities. Further sensitivity analysis was completed to establish a greater degree of confidence in the outputs. The paper also assesses the method of implementation used and discusses the robustness of the Strategy to Task approach in this application.>