Hello, I've been putting off secondaries because I can't decide what to do about my LoRs. Here's what I have: Art History lecturer: this is a good one Biochem professor: another good one The PI of my current lab: this is a great one The PI of my former lab: I'm really not sure what this letter is like... So.. I worked in my former lab for 3 years as an undergrad, but I hardly ever got to speak to the PI, and I really don't know what he thinks of me. I worked hard... and I put in 2 or 3 times more hours than I signed up for... but despite my efforts, I didn't get any good data. So, I'm worried that my former PI will write me a mediocre letter. Here's my question: Will it hurt me if I don't send his letter to schools? Will they wonder about this glaring absence in my letter stack? Should I risk it and send in a "blah" letter? Or will the spectacular letter from my current PI suffice? (I've worked for the current PI for 2 summers and I'll be his lab tech for a year) Thanks for your help on this!