Letters of rec?

[daisymae4]

Quick question about schools that request a letter from every PI you have worked with... How dead set are adcoms on that rule? I already have three letters from my primary PIs but haven't asked for letters from the other two due to the fact that it has been a long time since I worked with them (so I have changed a lot) and they didn't get to know me well since I only worked for each for a semester. Three schools I am applying to explicitly ask for letters from every research experience but this close to submission I don't want those two letters to hold back my application. Thoughts?

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[Maebea]

Quick question about schools that request a letter from every PI you have worked with... How dead set are adcoms on that rule? I already have three letters from my primary PIs but haven't asked for letters from the other two due to the fact that it has been a long time since I worked with them (so I have changed a lot) and they didn't get to know me well since I only worked for each for a semester. Three schools I am applying to explicitly ask for letters from every research experience but this close to submission I don't want those two letters to hold back my application. Thoughts?

Though my program usually requires letters from all PIs, we would grant an exception in your case: you only worked with the previous PIs for a semester and will have letters from 3 more recent PIs. I would just submit without the other letters. You should be fine.