1. Pick one or both of the JWST IFU observing modes based on needed wavelength coverage.
   MIRI Medium Resolution Spectroscopy (MRS) (4.9 to 27.9 μm)
   NIRSpec IFU Spectroscopy (0.6–5.3 μm)
   
   
2. Pick wavelength setting(s).
   MIRI MRS: Select SHORT, MEDIUM, or LONG channel, or some combination thereof
   NIRSpec IFU: Select dispersers and filters, depending on needed wavelength coverage and resolving power
   
   
3. For MIRI MRS, determine whether you should choose simultaneous imaging with the MIRI Imager.
   MIRI MRS Simultaneous Imaging
   
   
4. Decide if you need to do a mosaic.
   JWST Mosaic Overview
   MIRI MRS Mosaics
   
   
5. Pick a dither pattern.
   MIRI MRS PSF and Dithering, MIRI MRS Recommended Strategies
   NIRSpec IFU Dither and Nod Patterns, NIRSpec Bright Spoilers and the IFU Recommended Strategies
   
   
6. Determine whether you need a dedicated background observation.
   MIRI MRS Dedicated Sky Observations
   NIRSpec Background Recommended Strategies
   
   
7. For NIRSpec IFU: Decide whether you need to obtain leakcal observations to mitigate the effects of light that leaks through the NIRSpec Micro-Shutter Assembly (MSA) shutters
   NIRSpec MSA Leakage Correction for IFU Observations, NIRSpec MSA Leakage Subtraction Recommended Strategies
   
   
8. Decide if you should do a target acquisition (TA)
   MIRI MRS Target Acquisition
   NIRSpec Target Acquisition, NIRSpec Target Acquisition Recommended Strategies
   
   
9. Calculate the required exposure time and detector readout parameters using the Exposure Time Calculator (ETC).
   JWST ETC IFU Strategies
   JWST ETC MIRI Target Acquisition
   JWST ETC NIRSpec Target Acquisition
   
   
10. Fill out the Astronomer's Proposal Tool (APT) for your observation
    MIRI MRS APT Template
    NIRSpec IFU Spectroscopy APT Template

Go to the Getting Started with JWST Proposing to complete the steps for proposal submission.