Description: A methodology is to be developed that will allow the development and implementation of fault-tolerant control system for distributed collaborative spacecraft. The objective is to ensure that the cluster of spacecraft continue to meet high precision performance objectives in the presence of system faults and uncertainty. The proposed innovation is the development of a fault-tolerant control system for distributed spacecraft. The development process begins with fault-tolerant control system architecture and then the analysis of its performance. The essential elements of this proposed fault-tolerant control system architecture are: The fault detection filters and parity equations that generate residuals (the difference between the actual measurement and the estimated value) with important geometrical properties that enhance fault detection and identification. The residual processor that takes these corrupted residuals and announces a fault with a given probability of false and miss alarm in minimal time. A fault reconstruction system that estimates the fault magnitude once the fault has been identified. A distributed control system that reconfigures based on the particular fault and the fault magnitude.