A company is about to invite tenders for a contract to clean external windows at...

A company is about to invite tenders for a contract to clean external windows at several premises, all at least three storeys high. It is going to do this in two stages. For the first stage, it will issue a pre-qualification questionnaire (PQQ) and, from the replies, select at least five potential suppliers to invite to tender. Which of the following is a selection criterion rather than an award criterion?