In general, in one aspect, a system for planning and executing projects, facilitates creating a project model comprising tasks and dependencies, determining the complexity of the tasks, and modifying the tasks to maintain complexity within predetermined bounds. The system can facilitate designating one or more tasks to be redundant tasks, and undertaking the redundant tasks with redundant resources. In some embodiments, the system includes a module for evaluating task criticality and designating redundant tasks based on the task complexity and criticality.