| Keywords - SLevel	CategoryWords and Phrases
 SD	K.4.1Safety, Human [Computers and Society] 
 SD	I.4.1Sampling [Image Processing] 
 SD	I.3.3Scanning, Digitizing and [Computer Graphics] 
 SD	I.4.1Scanning [Image Processing] 
 ***	I.4.8Scene Analysis [Image Processing] 
 ***	I.2.10Scene Understanding, Vision [Artificial Intelligence] 
 SD	H.4.1Schedules [Information Systems Applications] 
 SD	D.4.1Scheduling [Operating Systems] 
 SD	F.2.2Scheduling, Sequencing and [Nonnumerical Algorithms and Problems] 
 SD	H.2.1Schema and subschema [Database Management] 
 SD	C.2.5Schemes, Access [Computer-Communication Networks] 
 SD	E.4Schemes, Nonsecret encoding 
 SD	F.3.3Schemes, Program and recursion 
 SD	K.3.2Science education, Computer 
 ***	K.3.2Science Education, Computer and Information 
 SD	I.2.1Science, Medicine and [Artificial Intelligence] 
 SD	D.2.8Science, Software [Metrics; Software Engineering] 
 SD°	J.2Sciences, Atmospheric [Computer Applications] 
 SD	J.2Sciences, Earth and atmospheric [Computer Applications] 
 **	J.3Sciences, Life and Medical [Computer Applications] 
 **	J.2Sciences, Physical, and Engineering [Computer Applications] 
 **	J.4Sciences, Social and Behavioral [Computer Applications] 
 SD	H.5.2Screen design (e.g., text, graphics, color) [Information Interfaces and Presentation] 
 SD	I.2.4Scripts and Frames [Knowledge Representation Formalisms and Methods; Artificial Intelligence] 
 ***	H.3.3Search and Retrieval, Information 
 ***	I.2.8Search, Problem Solving, Control Methods, and [Artificial Intelligence] 
 SD	H.3.3Search process [Information Storage and Retrieval] 
 SD	I.2.8Search strategies, Graph and tree 
 SD	F.2.2Searching, Sorting and [Nonnumerical Algorithms and Problems] 
 SD	D.4.2Secondary storage devices 
 SD	K.5.1Secrets, Trade 
 GT	GTSecurity 
 SD	C.2.0Security and protection[Computer-Communication Networks] 
 ***	K.6.5Security and Protection [Management of Computing and Information Systems] 
 ***	D.4.6Security and Protection [Operating Systems] 
 SD	H.2.0Security, integrity, and protection [Database Management] 
 SD	D.4.6Security kernels [Operating Systems] 
 SD	K.6.5Security, Physical [Management of Computing and Information Systems] 
 SD	K.6.mSecurity, Physical [retired January 1991] 
 ***	I.4.6Segmentation [Image Processing] 
 SD	D.4.2Segmentation [Storage Management; Operating Systems] 
 SD	K.6.2Selection, Computer 
 SD	I.5.2Selection, Feature evaluation and [Pattern Recognition] 
 SD	H.3.3Selection process [Information Storage and Retrieval] 
 SD	K.6.3Selection, Software 
 SD	H.3.4Selective dissemination of informationSDI [InformationStorage and Retrieval] 
 SD	K.3.2Self-assessment [Computers and Education] 
 SD	F.1.1Self-modifying machines (e.g., neural networks) [Models of Computation] 
 SD	I.2.4Semantic networks [Knowledge Representation Formalisms and Methods] 
 SD	F.3.2Semantics, Algebraic approaches to 
 SD	F.3.2Semantics, Denotational 
 ***	F.3.2Semantics of Programming Languages 
 SD	F.3.2Semantics, Operational 
 SD	D.3.1Semantics [Programming Languages] 
 SD	D.4.4Sending, Message 
 SD	I.4.8Sensor fusion [Image Processing] 
 SD	I.2.9Sensors [Robotics; Artificial Intelligence] 
 SD	F.2.2Sequencing and scheduling [Nonnumerical Algorithms and Problems] 
 SD	B.6.1Sequential circuits [Logic Design; Hardware] 
 ***	D.1.4Sequential Programming 
 SD	B.3.2Sequential-access memory 
 SD	I.4.5Series expansion methods [Reconstruction; Image Processing] 
 SD	C.4Serviceability, Reliability, availability, and [Performance of Systems] 
 ***	H.3.5Services, Online Information 
 SD	C.0Set design, Instruction [Computer Systems Organization] 
 SD	I.5.1Set, Fuzzy [Pattern Recognition] 
 SD	B.1.5Set interpretation, Instruction [Control Structures and Microprogramming] 
 SD	B.1.5Sets, Firmware support of operating systems/instruction [Control Structures and Microprogramming] 
 SD°	F.4.3Sets, Recursive 
 SD°	F.4.3Sets, Regular 
 SD	I.3.7Shading [Computer Graphics] 
 SD	I.3.7Shadowing [Computer Graphics] 
 SD	I.4.7Shape and Size [Image Processing] 
 SD	I.2.10Shape [Artificial Intelligence] 
 SD	B.3.2Shared memory 
 SD	H.3.5Sharing, Data bank [Information Storage and Retrieval] 
 SD	I.4.3Sharpening and deblurring [Image Processing] 
 SD	I.5.4Signal processing [Applications; Pattern Recognition] 
 SD	C.3Signal processing systems [Special-Purpose and Application-Based Systems] 
 SD	C.1.2SIMD (Single-instruction-stream, multiple-data-streamprocessors) 
 SD	I.5.3Similarity measures [Pattern Recognition] 
 SD	I.1.1Simplification of expressions [Algebraic Manipulation] 
 **	I.6Simulation and Modeling [Computing Methodologies] 
 SD	B.2.2Simulation [Arithmetic and Logic Structures] 
 SD	I.2.0Simulation, Cognitive 
 SD°	I.6.1Simulation, Continuous 
 SD	B.1.2Simulation [Control Structures and Microprogramming] 
 SD	B.6.3Simulation [Logic Design; Hardware] 
 SD°	I.6.1Simulation, Discrete 
 SD	B.4.4Simulation [Input/Output and Data Communications] 
 SD	B.7.2Simulation [Integrated Circuits] 
 ***	I.6.2Simulation Languages 
 SD	B.3.3Simulation [Memory Structures] 
 SD	D.4.8Simulation [Operating Systems] 
 ***	I.6.6Simulation Output Analysis 
 SD	B.5.2Simulation [Register-Transfer-Level Implementation] 
 ***	I.6.7Simulation Support Systems 
 ***	I.6.1Simulation Theory 
 ***	I.6.8Simulation, Types of 
 SD°	I.6.1Simulation, Types of (continuous and discrete)[retired January 1991] 
 ***	C.1.1Single Data Stream Architectures [Processor Architectures] 
 SD	G.1.7Single step methods [Numerical Analysis] 
 SD	C.1.1Single-data-stream, Multiple-instruction-stream processors (MISD) [Processor Architectures] 
 SD	C.1.1Single-data-stream, Single-instruction-stream processors (SISD)[Processor Architectures] 
 SD	C.1.2Single-instruction-stream, multiple-data-stream processors (SIMD) [Processor Architectures] 
 SD	C.1.1Single-instruction-stream, single-data-stream processors (SISD) [Processor Architectures] 
 SD	C.1.1SISD (Single-instruction-stream, single-data-stream processors) 
 SD	I.4.7Size and shape [Image Processing] 
 SD	I.4.3Smoothing [Image Processing] 
 SD	G.1.1Smoothing [Interpolation] 
 **	J.4Social and Behavioral Sciences [Computer Applications] 
 ***	K.4.2Social Issues 
 **	K.4Society and Computers 
 SD	J.4Sociology [Computer Applications] 
 *	DSoftware 
 SD	D.2.9Software configuration management [Software Engineering] 
 SD	K.6.3Software development [Management of Computing and Information Systems] 
 **	D.2Software Engineering 
 SD	D.2.2Software engineering, Computer-aided 
 SD	K.2Software [History of Computing] 
 SD	I.4.0Software, Image processing 
 SD	K.6.5Software, Invasive [Management of Computing and Information Systems] 
 SD	D.4.6Software, Invasive [Operating Systems] 
 SD	D.2.2Software libraries 
 SD	K.6.3Software maintenance [Management of Computing and Information Systems] 
 ***	K.6.3Software Management [Management of Computing and Information Systems] 
 **	G.4Software, Mathematical 
 ***	I.2.5Software, Programming Languages and [Artificial Intelligence] 
 ***	K.5.1Software Protection [Legal Aspects of Computing] 
 SD	D.mSoftware psychology 
 SD	D.2.9Software quality assurance (SQA) [Software Engineering] 
 SD	D.2.mSoftware, Reusable 
 SD	D.2.8Software science [Metrics; Software Engineering] 
 SD	K.6.3Software selection [Management of Computing and Information Systems] 
 SD	G.3Software, Statistical 
 SD	I.3.4Software support [Computer Graphics] 
 ***	H.3.4Software, Systems and [Information Storage and Retrieval] 
 SD	I.3.5Solid geometry, Constructive [Computer Graphics] 
 SD°	I.3.5Solid representations [Computer Graphics] 
 SD	F.2.2Sorting and searching [Nonnumerical Algorithms and Problems] 
 SD	E.5Sorting/searching [Data] 
 SD	G.1.3Sparse and very large systems 
 SD	I.5.5Special architectures [Pattern Recognition] 
 SD	K.4.2Special needs, handicapped persons 
 SD	D.3.2Specialized application languages 
 SD	I.1.3Special-purpose algebraic systems [Algebraic Manipulation] 
 **	C.3Special-Purpose and Application-Based Systems 
 SD	I.1.3Special-purpose hardware [Algebraic Manipulation] 
 SD	B.1.5Special-purpose microcode applications 
 SD°	B.5.1Special-purpose styles [Register-Transfer-Level Implementation] 
 SD	C.0Specification methodology, Systems 
 SD	F.3.1Specification techniques [Logics and Meanings of Programs] 
 ***	F.3.1Specifying and Verifying and Reasoning about Programs [Logics and Meanings of Programs] 
 SD	I.2.7Speech recognition and synthesis [Artificial Intelligence] 
 SD	I.7.1Spelling [Text Processing] 
 SD	G.1.2Spline and piecewise polynomial approximation 
 SD	G.1.1Spline and piecewise polynomial interpolation 
 SD	I.3.5Splines [Computer Graphics] 
 SD	H.4.1Spreadsheets [Information Systems Applications] 
 SD	K.8.1Spreadsheets [Personal Computing] 
 SD	D.2.9SQA (Software quality assurance) [Software Engineering] 
 SD	G.1.2Squares approximation, Least 
 SD	G.1.6Squares methods, Least 
 SD	G.1.0Stability (and instability) [Numerical Analysis] 
 SD	G.1.7Stability, Convergence and [Ordinary Differential Equations] 
 SD	C.1.3Stack-oriented processors [Processor Architectures] 
 SD	K.6.1Staffing [Management of Computing and Information Systems] 
 SD	I.3.2Stand-alone systems [Computer Graphics] 
 SD	B.7.1Standard cells [Integrated Circuits] 
 SD	E.3Standard, Data encryption (DES) 
 GT	GTStandardization 
 SD	D.2.3Standards [Coding; Software Engineering] 
 SD	I.7.2Standards [Text Processing] 
 SD	I.3.6Standards [Computer Graphics] 
 SD	D.3.0Standards [Programming Languages] 
 SD	D.2.0Standards [Software Engineering] 
 SD	K.1Standards [The Computer Industry] 
 SD	G.3Statistical computing 
 SD	I.4.10Statistical [Image Processing] 
 SD	I.5.1Statistical [Pattern Recognition] 
 SD	G.3Statistical software 
 SD	J.2Statistics, Mathematics and [Computer Applications] 
 **	G.3Statistics, Probability and 
 SD	K.1Statistics [The Computer Industry] 
 SD	G.1.7Step methods, Single 
 SD	I.4.8Stereo [Image Processing] 
 SD	G.1.7Stiff equations [Ordinary Differential Equations] 
 SD	D.4.8Stochastic analysis [Performance; Operating Systems] 
 **	H.3Storage and Retrieval, Information 
 SD	I.3.1Storage devices [Computer Graphics] 
 SD	D.4.2Storage devices, Secondary [Operating Systems] 
 SD	D.4.2Storage hierarchies [Operating Systems] 
 ***	H.3.2Storage, Information 
 SD	D.3.3Storage management, Dynamic [Programming Languages] 
 ***	D.4.2Storage Management [Operating Systems] 
 SD	B.3.2Storage, Mass 
 **	E.2Storage Representations, Data 
 SD	D.4.2Storage, Secondary [Operating Systems] 
 SD	C.2.1Store and forward networks 
 SD	B.1.1Store, Writable control 
 SD	D.4.2Strategies, Allocation/deallocation [Storage Management; Operating Systems] 
 SD	I.1.3Strategies, Evaluation [Algebraic Manipulation] 
 SD	I.2.8Strategies, Graph and tree search [Artificial Intelligence] 
 SD	H.5.2Strategies, Input devices and [Information Interfaces and Presentation] 
 ***	C.1.2Stream Architectures, Multiple Data 
 ***	C.1.1Stream Architectures, Single Data 
 SD	I.5.1Structural [Pattern Recognition] 
 SD°	E.5Structure [Files; Data] 
 ***	B.1.2Structure Performance Analysis and Design Aids, Control 
 ***	B.1.3Structure Reliability, Testing, and Fault-Tolerance,Control 
 SD	F.3.3Structure, Type [Studies of Program Constructs; Logics and Meanings of Programs] 
 SD	D.2.2Structured programming 
 SD	I.3.6Structures and data types, Graphics data 
 **	B.1Structures and Microprogramming, Control 
 SD	I.2.10Structures, and transforms, Representations, data [Artificial Intelligence] 
 SD	I.2.10Structures, Architecture and control [Artificial Intelligence] 
 **	B.2Structures, Arithmetic and Logic [Hardware] 
 SD	E.2Structures, Composite [Data Storage Representations] 
 SD	F.2.2Structures, Computations on discrete 
 SD	D.3.3Structures, Concurrent programming [Language Constructs] 
 SD	D.3.3Structures, Control [Language Constructs; Programming Languages] 
 **	E.1Structures, Data [Data] 
 SD	D.3.3Structures, Data types and [Language Constructs; Programming Languages] 
 SD°	I.2.10Structures, Data [Vision and Scene Understanding; Artificial Intelligence] 
 SD	D.4.3Structures, Directory [Operating Systems] 
 SD	I.2.11Structures, Languages and [Artificial Intelligence] 
 **	B.3Structures, Memory [Hardware] 
 SD	B.4.3Structures, Physical [Input/Output and Data Communications] 
 SD	C.4Studies, Design [Performance of Systems] 
 ***	F.3.3Studies of Program Constructs 
 ***	B.1.1Styles, Control Design [Control Structures and Microprogramming] 
 ***	B.2.1Styles, Design [Arithmetic and Logic Structures] 
 ***	B.6.1Styles, Design [Logic Design] 
 ***	B.3.2Styles, Design [Memory Structures] 
 ***°	B.7.1Styles, Design [Integrated Circuits] 
 SD	H.5.2Styles, Interaction [Information Interfaces and Presentation] 
 ***	C.1.3Styles, Other Architecture 
 SD	B.5.1Styles [Register-Transfer-Level Implementation] 
 ***	B.7.1Styles, Types and Design [Integrated Circuits] 
 SD	D.3.3Subroutines, Procedures, functions, and [Language Constructs] 
 SD	H.2.1Subschema, Schema and [Database Management] 
 SD	I.1.3Substitution mechanisms [Algebraic Manipulation] 
 ***	B.4.3Subsystems [Input/Output and Data Communications] 
 SD	I.4.5Summation methods [Reconstruction; Image Processing] 
 SD	C.5.1Super (very large) computers 
 SD	K.6.5Supererogation 
 SD	K.1Suppliers [The Computer Industry] 
 SD	H.4.2Support, Decision [Types of Systems; Information Systems Applications] 
 SD	B.1.5Support of operating systems/instruction sets, Firmware 
 SD	I.3.4Support, Software [Computer Graphics] 
 ***	I.6.7Support Systems, Simulation [Simulation and Modeling] 
 SD	I.3.5Surface representations [Computer Graphics] 
 **	A.1Survey, Introductory and [General Literature] 
 SD	D.4.2Swapping [Storage Management; Operating Systems] 
 SD°	C.1.2Switch, Crossbar 
 SD	C.2.1Switching networks, Circuit 
 SD	B.6.3Switching theory [Logic Design; Hardware] 
 SD	D.2.5Symbolic execution [Testing and Debugging; Software Engineering] 
 SD	D.4.1Synchronization [Operating Systems] 
 SD	H.5.3Synchronous interaction [Information Interfaces and Presentation] 
 SD°	B.4.3Synchronous/Asynchronous operation[Input/Output and Data Communications] 
 SD	D.3.1Syntax [Programming Languages] 
 SD	B.1.2Synthesis, Automatic [Control Structures and Microprogramming] 
 SD	B.5.2Synthesis, Automatic [Register-Transfer-Level Implementation; Hardware] 
 SD	B.6.3Synthesis, Automatic [Logic Design] 
 SD	I.2.2Synthesis, Program [Automatic Programming; Artificial Intelligence] 
 SD	I.2.7Synthesis, Speech recognition and 
 SD	C.0System architectures 
 **	C.5System Implementation, Computer 
 ***	K.6.4System Management [Management of Computing and Information Systems] 
 SD	I.2.5System tools and techniques, Expert [Artificial Intelligence] 
 SD	K.6.1Systems analysis and design [Management of Computing and Information Systems] 
 SD	D.3.4Systems and compiler generators, Translator writing [Programming Languages] 
 ***	H.1.1Systems and Information Theory 
 ***	H.3.4Systems and Software [Information Storage and Retrieval] 
 **°	C.3Systems, Application-Based 
 ***	I.2.1Systems, Applications and Expert 
 **	H.4Systems Applications, Information 
 SD	D.4.7Systems, Batch processing [Operating Systems] 
 *	CSystems, Computer Systems Organization 
 **	J.7Systems, Computers in Other 
 SD	H.3.4Systems, Current awareness [Information Storage and Retrieval] 
 ***	H.2.4Systems [Database Management] 
 SD	K.6.1Systems development [Management of Computing and Information Systems] 
 ***	C.2.4Systems, Distributed [Computer-Communication Networks] 
 SD	H.2.4Systems, Distributed [Database Management] 
 SD	D.4.7Systems, Distributed [Operating Systems] 
 SD	D.4.3Systems, Distributed file 
 SD	K.3.2Systems education, Information 
 ***	D.4.3Systems, File Management 
 SD	H.1.1Systems, General Systems Theory 
 SD	I.3.5Systems, Geometric algorithms, languages, and [Computer Graphics] 
 ***	F.4.2Systems, Grammars and Other Rewriting 
 ***	I.3.2Systems, Graphics 
 SD	K.2Systems [History of Computing] 
 SD	C.1.mSystems, Hybrid 
 *	HSystems, Information  
 **°	H.4Systems, Information Systems Applications 
 SD	K.3.2Systems, Information Systems Education 
 SD	D.4.7Systems, Interactive [Operating Systems] 
 SD	I.5.5Systems, Interactive [Pattern Recognition] 
 SD	F.4.1Systems, Lambda calculus and related [Mathematical Logic and Formal Languages] 
 ***	I.1.3Systems, Languages and [Algebraic Manipulation] 
 SD	I.7.2Systems, Languages and [Text Processing] 
 SD	G.1.3Systems, Linear (direct and iterative methods) 
 ***	D.4.3Systems Management, File 
 **	K.6Systems, Management of Computing and Information 
 SD	J.3Systems, Medical information [Computer Applications] 
 ***	H.5.1Systems, Multimedia Information 
 SD	C.2.4Systems, Network operating [Computer-Communication Networks] 
 SD	G.1.5Systems of equations [Roots of Nonlinear Equations] 
 **	D.4Systems, Operating 
 *	CSystems Organization, Computer 
 SD	I.3.4Systems, Paint [Computer Graphics] 
 SD	F.4.2Systems, Parallel rewriting 
 **	C.4Systems, Performance of 
 SD	C.3Systems, Process control 
 ***	D.4.9Systems Programs and Utilities [Operating Systems] 
 SD	H.3.4Systems, Question-answering (fact retrieval) 
 SD	C.3Systems, Real-time [Special-Purpose and Application-Based Systems] 
 SD	D.4.7Systems, Real-time and embedded [Operating Systems] 
 SD	I.2.4Systems, Relation [Artificial Intelligence] 
 SD	I.3.2Systems, Remote [Computer Graphics] 
 SD	C.3Systems, Signal processing [Special-Purpose and Application-Based Systems] 
 ***	I.6.7Systems, Simulation Support 
 SD	G.1.3Systems, Sparse and very large 
 SD	I.1.3Systems, Special-purpose algebraic 
 **	C.3Systems, Special-Purpose and Application-Based 
 SD	C.0Systems specification methodology 
 SD	I.3.2Systems, Stand-alone [Computer Graphics] 
 SD	H.1.1Systems theory, General 
 SD	I.6.1Systems theory [Simulation and Modeling] 
 SD	F.4.2Systems, Thue 
 ***	H.4.2Systems, Types of [Information Systems Applications] 
 SD	H.5.2Systems, User interface management (UIMS) 
 ***	H.1.2Systems, User/Machine 
 ***	C.5.4Systems, VLSI [Computer System Implementation] 
 SD	H.5.2Systems, Windowing 
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