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The main idea behind this thinking is that functions may contain variables defined in the SLA or be drawn from the known set of reference variables, such as wall\u2010clock time, job start time, current bandwidth of the resource, etc. Experiences and conclusions drawn are in the context of SLA\u2010based job management systems. We demonstrate that the use of analytical expressions in SLAs can potentially reduce the overheads associated with job renegotiation and\/or reduce the number of failed agreements. Copyright \u00a9 2006 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/cpe.1140","type":"journal-article","created":{"date-parts":[[2006,11,18]],"date-time":"2006-11-18T02:49:40Z","timestamp":1163818180000},"page":"1975-1990","source":"Crossref","is-referenced-by-count":9,"title":["Towards increased expressiveness in service level agreements"],"prefix":"10.1002","volume":"19","author":[{"given":"Viktor","family":"Yarmolenko","sequence":"first","affiliation":[]},{"given":"Rizos","family":"Sakellariou","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2006,11,14]]},"reference":[{"key":"e_1_2_1_2_2","unstructured":"AndrieuxA CzajkowskiK DanA KeaheyK LudwigH PruyneJ RofranoJ TueckeS XuM. Web Services Agreement (WS\u2010Agreement) Specification Version 2005\/09.GWD\u2010R (Proposed Recommendation) to Global Grid Forum Global Grid Forum 20 September2005. 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