Usability specification

During and after the build process ISO 62366 then requires the user interface to be tested and verified against the usability specification. Where the prodnct fails to meet the usability requirements this may act as the seed for a change in the design. This forms the basis of an iterative usability cycle where the product or a prototype is subject to constant verification by individuals who are representative of the intended user-base. 

The task analysis provides a structured description of the activities that permits a high-profiling of the task, the context ofworkandthe users needs. However, task analysis is more focused on what the operators are expected to do than on how they actually perform their activities from their own perspective. Another method, based on user scenarios, seems to be more suitable to examine user activities from the visual perspective (e.g. location, gaze direction, affordances and constraints on movement) and generate functional and usability specifications for virtual environments (VE). The critical hnk for this information is the fact that for each node of the task model (especially critical decision-points), the important performance shaping factors and tools to be used are recorded. They are... 

In the Virthualis application, the storyboard technique was viewed less as preliminary simulation than as the rationale for usability specifications and aims at ... 

TABLE 34.4 Comparison of Usable Specific Capacity (Ah/kg) and Capacity Density (Ah/L) for Lithiated Carbon vs. Lithium Metal Anodes... 

In term of efficiency, I will focus on usability, specifically, on learnability. Once a user learns how to use the system and obtain skill, then the interaction between such users and the systems become transparent. This transparency, then, is achieved when the user has shifted their focus of interaction from the technologies to the tasks. 

This approach is more close to X-ray stereo imaging and caimot reach enough depth resolution. There are also several systems with linear movement (1-dimensional) through the conical beam [5] as shown in Fig.4. In this case usable depth and spatial resolution can be achieved for specifically oriented parts of the object only. 

Economics and price of the final article often dictate a specific type of mbber that can be used. The expected usable life for the product is controlled by many factors including end customer awareness, competitive situation in the marketplace, safety, reUabiUty, and other factors. Rubber is almost always used as a functional part of another system. For example tires, hoses, belts, O-rings, and numerous mbber components are used in manufacturing automobiles and tmcks. The overall life of the vehicle as well as its performance level often control or direcdy relate to the service life or quaUty level of the mbber parts. 

F.ach of the three categories has many different types of systems. Some common types are described here and for most of the systems the detailed description includes the name and the principle. When and where to apply the different systems and the different forms that may exist are also included.. Nearly all systems have some specific issue to be addressed when designing that type of system. Equations and/or parameters are included where available. For some systems, many different equations are available, from which the most accurate or usable have been selected for inclusion. For systems where only one equation exists, it has been described and the limitations identified. If no equations are available, other design parameters and considerations are described. 

Fiber Relative strength Specific gravity Normal moisture content (%) Maximum usable temperature ( F) Acid Base Organic solvent Other attribute... 

These Monographs are intended to serve two principal purposes first, to make available to chemists a thorough treatment of a selected area in a form usable by persons working in more or less unrelated fields so that they may correlate their own work with a larger area of physical science and second, to stimulate further research in the specific field treated. To implement this purpose the authors of Monographs give extended references to the literature. 

At the practical level, an ideal mechanistic biomarker should be simple to use, sensitive, relatively specific, stable, and usable on material that can be obtained by nondestructive sampling (e.g., blood or skin). A tall order, no doubt, and no biomarker yet developed has all of these attributes. However, the judicious use of combinations of biomarkers can overcome the shortcomings of individual assays. The main point to emphasize is that the resources so far invested in the development of biomarker technology for environmental risk assessment has been very small (cf the investment in biomarkers for use in medicine). Knowledge of toxic mechanisms of organic pollutants is already substantial (especially of pesticides), and it grows apace. The scientific basis is already there for technological advance it all comes down to a question of investment. 

Food coloring is restricted by law to prevent misuse that may lead to deception of consumers related to reduced value or usability. For this purpose, the European Union implemented food colorant guidelines in 1994 based on the understanding that food coloration presents a technological need. While European Parliament and Council Directive 94/36/EC lists colors and their uses in food, the European Commission Directive 95/45/EC contains specific purity criteria for colors in foodstuffs, e.g., a maximal lead content of 20 ppm. " ... 

The limit of tolerable error is generally smallest in a minor component assay. It will have been determined that a particular minor component must be at or below a threshold concentration for the product to be usable. Therefore, the decision to accept or reject an entire production batch may depend on the analytical result. Typical batches may contain the contaminant at a concentration very similar to the specification limit. In a minor component assay, the major component may be overloaded and out of the proper range of detection of the assay. Even so, the minor component may be at such low levels that assay noise interferes. 

In the LCI, we have to rely on databases that are more or less incomplete. In general, production data are best covered, but even there may be gaps. Data on consumption and use processes are scarce in general - for additives, these use processes may be important since additives may leach out or evaporate from products in use. On waste treatment the data situation is also not very good. Average waste treatment processes out of LCI databases are not usable - these describe emissions out of municipal waste treatment in general. Sometimes specific... 

More recently, some reports have been picked from the Internet, when two of the three following conditions obtained the editor finds the report credible it represents a hazard not already present in the handbook or the source is authoritative. Information on toxic hazards has been specifically excluded because it is available elsewhere in many well-ordered and readily usable forms. 

Less usable in general, although useful for specific applications,... 

Also indices such as the Dow Fire and Explosion Hazard Index and the Mond Index have been suggested to measure the degree of inherent SHE of a process. Rushton et al. (1994) pointed out that these indices can be used for the assessment of existing plants or at the detailed design stages. They require detailed plant specifications such as the plot plan, equipment sizes, material inventories and flows. Checklists, interaction matrices, Hazop and other hazard identification tools are also usable for the evaluation, because all hazards must be identified and their potential consequences must be understood. E.g. Hazop can be used in different stages of process design but in restricted mode. A complete Hazop-study requires final process plans with flow sheets and PIDs. 

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