The HNO is a critical document in the HPC, a clear understanding of need is required before an adequate response can be planned or implemented.  Work on the HNO should begin 6-8 months before the document is due as there are many dependencies.  Ideally, the OCHA office should have a timeline or work plan for the entire HPC with clear deadlines and responsibilities.   

Dependences for the HNO include:

Essential reading on the Humanitarian Needs Overview for IMOs

Recommended reading on Humanitarian Needs Overview for IMOs

HNO Checklist for IMOs