I know having a letter of recommendation from a research advisor is great. However, the research advisor I am currently working with barely knows me. He will be my advisor for about 5 more weeks, but I do not see him suddenly becoming interested in my project (I'm working with the postdoc), or interested in me/my goals. I plan to include this research experience in my graduate school applications. I will also have letters from other advisors I have done research with (I don't want to ask each advisor to write 8 letters, so I was going to include classroom instructors to spread it out) First question: Is a letter from a research advisor who barely knows me better than a letter from a classroom instructor who does? Second question: Will a committee look at my research experience and wonder why there are not letters from every advisor in my application? Thanks.