Table 4‑1: Stages of a project and radiation effects analyses performed

Phase	Activity
Pre-phase A	Environment specification for each mission option; Preliminary assessment of sensitivities and availability of components
A	Environment specification for baseline mission and options where they are retained for consideration Preliminary assessment of sensitivities and availability of components
B	Environment specification update; Space radiation hardness assurance requirements including detailed analysis of component requirements and identification of availability of susceptibility data; Establishment and execution of component test plan
C & D	Accurate shielding and radiation effects analysis (including component-specific analysis)^a Consolidation of test results; augmented testing
E	Investigation of radiation effects; consideration of radiation effects in anomaly investigation; feedback to engineering groups of lessons learned including e.g. radiation related anomalies.
^a If mission assumptions change in this phase, such as the proposed orbit, a complete re-evaluation of the radiation environment specification is performed.