I am considering soliciting an IDIQ contract using sealed bid procedures. I haven't found anything in the FAR that says I can't do this, but I have found a contract-type matix chart from one source that says I can't use the sealed bid method for an indefinite delivery contract and a chart from another source that says I can use IFB or Negotiated Methods for an indefinite delivery contract. Can anybody tell me the correct answer and explain why I can or can't use a particular method?