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We use Tarski's relational calculus to construct a model of linear temporal logic. Both discrete and dense time are covered and we obtain denotational domains for a large variety of reactive systems. Keywords : Relational algebra, reactive systems, temporal algebra, temporal logic. 1

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Background Few investigators have evaluated pain assessment tools in the critical care setting. Objective To evaluate the reliability and validity of the Face, Legs, Activity, Cry, Consolability (FLACC) Behavioral Scale in assessing pain in critically ill adults and children unable to self-report pain. Methods Three nurses simultaneously, but independently, observed and scored pain behaviors twice in 29 critically ill adults and 8 children: before administration of an analgesic or during a painful procedure, and 15 to 30 minutes after the administration or procedure. Two nurses used the FLACC scale, the third used either the Checklist of Nonverbal Pain Indicators (for adults) or the COMFORT scale (for children). Results For 73 observations, FLACC scores correlated highly with the other 2 scores (ρ = 0.963 and 0.849, respectively),

Aims and Scope: Agronomy Research is biannually published peer-reviewed international Journal intended for publication broad-spectrum original articles, reviews and short communications in actual problems of modern agriculture incl. crop and animal science, genetics, economics, engineering aspects, agriculture and environmental relations, agroecology etc. in the temperate regions of the world. Copyright:

(which includes seven working papers and the Social Norms Quarterly), please go to www.paper-clip.com or call 973 256-1333 for subscription informa-tion. a pub l i ca t ion o f The Repor t on Soc ia l Norms Work i ng

working papers and the Social Norms Quarterly), or for pur-chase of individual copies, please go to www.paper-clip.com or call 973 546-3097 for subscription informa-tion. a pub l i ca t ion o f The Repor t on Soc ia l Norms W o r k i n g P a p e r # 4 Editor’s Note This Working Paper focuses on a

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