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Electronic Bidding Instructions

Design and Construction will be posting all bid opportunities on the new SIGMA Vendor Self Service (VSS) system. SIGMA VSS replaces Buy4Michigan and Contract and Payment Express, providing one secure location for vendors to respond to solicitations and track payment information.


PLEASE NOTE: If you have an existing active account in Buy4Michigan, it will be automatically transferred to SIGMA VSS. However, you will not be able to submit vendor responses (bids) in SIGMA VSS until you have “claimed” your account.


For assistance with SIGMA VSS, you may contact the SIGMA Help Desk by telephone at 1-888-734-9749 or by email at