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AI / Agentic AI Interview Questions

What is the difference between sequential, hierarchical, and concurrent multi-agent orchestration?
Orchestration styleHow agents coordinate
SequentialAgents run one after another, each building on the previous agent's output
HierarchicalA coordinating orchestrator agent delegates subtasks to specialized worker agents
ConcurrentMultiple agents work on different parts of a task at the same time, in parallel

The right choice depends on task structure, sequential fits pipelines where each stage genuinely depends on the last, hierarchical fits tasks that decompose cleanly into independent subtasks, and concurrent fits tasks where speed matters and subtasks don't depend on each other's results.

Which style has agents running one after another, building on prior output?
Which style involves a coordinating agent delegating subtasks?

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