This thesis is about establishing a Standard Operation Procedure (SOP) in a refrigerating storage house, which stores blood plasm and medicinal products. The topic of the Standard Operation Procedure is Supplier Qualification and it is required to provide quality and standardisation of a constantly repeated process. In order to define articles of agreement, qualification and auditing for Supplier, the Arzneimittelbetriebsordnung and GxP Guidelines (GMP = Good Manufacturing Practice, GDP = Good Distribution Practice) must be read. In this SOP the articles of agreement in a Quality Agreement were selected. Also the responsibilities and the qualifcation topics were defined. Requirements for premises, storage conditions, transport conditions and personnel, which are audited were selected and defined.