The result of evaluation is a value called the elementary preference, which can be defined as the percentage of satisfied requirements. For example, let R be the response time of an interactive terminal, and let E be the corresponding elementary preference. If we consider that R<1 sec perfectly satisfies our requirements and R>6 sec is fully unacceptable then the corresponding elementary criterion can be organized as the presented function E(R).
Methodology
Simplifying decisions, not decision logic
Advanced Decision Methodology
SEAS captures complex human decision logic, and reapplies this logic to selection decisions. Our proprietary evaluation methodology precisely and completely expresses the needs of users. With hundreds of preference functions to capture buyer requirements and the power to handle tradeoffs and exceptions, LSP methodology offers a proven advantage over other methods in use today. Whereas widespread scoring methods such as "weighted average" can lead to unreliable results, SEAS guarantees accurate and fast evaluations. Our goal is to allow decision makers to focus on budget and business decisions, while our consultants handle all the complexities of a comparison and selection project.
The LSP Method
Logic Scoring of Preference (LSP) is a cutting-edge, proprietary evaluation methodology with theoretical foundations in continuous logic and advanced optimization techniques. LSP has been used in over 50 professional projects involving evaluation, optimization, comparison, and selection of products and services.
LSP : Eight Basic Steps in a Selection Process Evaluating a complex system involves specifying criteria for all system attributes, aggregating preferences and data, and finally, quantifying the fit between the system and the requirements. The LSP method includes eight basic steps:
Performance variables are all individually evaluated characteristics of analyzed systems. For example, the majority of computer systems can be evaluated using 40 to 120 performance variables from four main groups:
The performance variables are derived using a hierarchical decomposition of the above groups. Elementary criteria define how to evaluate performance variables. Using E(R) we can compute the elementary preference E for any value of the response time R. For each competitive system we use elementary criteria to compute n elementary preferences. Using a stepwise aggregation technique the elementary preferences can be aggregated yielding the global preference. The aggregation process is based on a set of sophisticated continuous preference logic operators having high expressive power to model the most complex logic relationships exactly reflecting all user-specific requirements. Combining elementary criteria with a preference aggregation structure yields the presented model of a complex criterion. 
The end user participates in the creation of the criterion function. This approach gives the ultimate expressive power for exact modeling of user's needs. The global preference E denotes the global percentage of fulfilled requirements. Cost-Preference Analysis
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