in the inmate cells for 23 hours a day. In the course of a contact meeting between the NPM and the Federal Ministry of Justice, which took place in September 2015, it was stated that the use of prefabricated construction (module construction) would have to be considered if the numbers of detainees continued to grow. Expansion by prefabricated construction  Overcrowding and the small size of inmate cells are particularly concerning in light of the fact that most of the detainees have no employment and are confined to their cells for 23 hours a day. Prices for consumer goods are too high in the prison commissaries at the Innsbruck correctional institution and Wilhelmshöhe satellite facility of the Vienna-Josefstadt correctional institution In both the Innsbruck correctional institution and the Wilhelmshöhe satellite facility of the Vienna-Josefstadt correctional institution the commissions were confronted by criticisms from detainees, who complained that the prices of consumer goods in the prison commissary are higher than in the surrounding supermarkets. The NPM advocates that the prices of consumer goods should not be higher than those in the surrounding supermarkets. The Federal Ministry of Justice confirms that the prices should generally be based on the prices charged by comparable local suppliers. Criticism of pricing policies was voiced in other correctional institutions as well. The Federal Ministry of Justice therefore commissioned a nationwide survey. Based on the results of this survey, it was decided that an invitation to tender via the federal procurement agency (Bundesbeschaffung GmbH) would make sense and be economical. Due to the high volume and level of complexity, the Ministry estimates that the duration of the competitive bidding procedure will be lengthy. Nationwide competitive bidding procedure is underway Moreover, the Wilhelmshöhe satellite facility plans to introduce special offers starting in 2016. Each will contain five food or luxury items. Additional offers starting in 2016  The prices of consumer goods in the Innsbruck correctional institution and the Wilhelmshöhe satellite facility of the Vienna-Josefstadt correctional institution may not be higher than in the surrounding supermarkets. 2.5.2.3. Work and occupational opportunities Rigid lock-up times and insufficient employment The personnel shortage continues to be a central problem in Austrian correctional institutions. In numerous correctional institutions (particularly Vienna-Josefstadt, Wiener Neustadt, St. Pölten, Garsten, Klagenfurt and Graz-Jakomini) the NPM continuously observed rigid lock-up times and unstructured daily routines due to limited employment opportunities and inadequate activity programmes for Personnel shortages and their consequences 106