lecture14总复习课程.ppt

清 华 大 学 软 件 学 院 2004年6月8日ERSE, ?, O Where E is a set of entities ? is a set of empirical relations RiRi has an arity ni, i.e., Ri ? Eni O is a set of binary operations among entities.each binary operation oj is functionoj : E?E ? ENRSV,?, P where V is a set of values ? is a set of numerical relations. Si has the same arity ni of the empirical Ri , i.e., Si ? Eni P is a set of binary operations among values.each binary operation ?j is functionj : V?V ? V Metric:m : E?Va function that associates a value with each entity Notice:establishes a link between the set of entities and the set of values, regardless of the relations and operations in the empirical and numerical relational system Representation condition ?i?1..n, ?e1,…,en?E, ?Ri??, ?SiRie1,…,en?Sime1,…,men ?j?1..m ?e1,e2 ? Eme1 oj e2 me1 ?j me2 A scale is a triple ERS, NRS, m where ERSE, ?, O is an empirical relational sys. NRSV,?, P is a numerical relational sys. m : E?V is a metric that satisfies theRepresentation condition Admissible TransformationGiven a scale ERS, NRS, m, a transformation f is admissible if ERS, NRS, m′ is a scale, where m′ f o m is the composition of f and m Rescalingm′ is called as a rescaling of mdifferent scales permit different types of admissible transformation COCOMO: Intermediate The Intermediate COCOMO: 0.32 2.5 Embedded 0.35 2.5 Semi-detached 0.38 2.5 Organic d c Mode 1.20 2.8 Embedded 1.12 3.0 Semi-detached 1.05 3.2 Organic b a Mode COCOMO II Application CompositionE OP / PROD Early Design modelE 2.45 × KLOC × EAF Post-Architecture model Putnam’s SLIM Section 7Software Test Metrics Unadjusted FP Count UFC function point complexity weights 10 7 5 Internal files Nif 15 10 7 External interface files Nef 6 4 3 External inquiries Nq 7 5 4 External outputs No 6 4 3 External inputs Ni Complex Average Simple Weighting Factor Item Tech.Complexity Factor TCF/1 Facilitate change F14 Multiple sites F13 Installation ease F12 Reusability F11 Complex processing F10 Compl