Table 4.

Additional relevant features.

Requirement type	Relevant features
Availability	availability, available, uptime, mtbf, uptime, system, support, time, hours, whenever, demand.
Legal and Licensing	licensing, legal, law, rule, rules, regulation, law, legal, claim, norm, sarbanesoxley, eula, comply, confirm, meet, violate, violating, violated, follow, agree, requirement, term, condition, accounting, standard.
Fault Tolerance	malfunction, fault, fail, failure, loss, error, warn, alive, handle, prevent, recover, retain, remain, operational, restored, system, back, connection, unavailable, operate, operating.
Security	trusted, unauthorized, malicious, hacker, illegal, secure, security, securely, limited, control, private, password, constrained, constraint, access, accessible, only, need, allow, allowed, require, required, IP address, log, logged, encrypt, encryption, hide, hidden, invisible, password, authentic, PW, attempt, unique, valid, tracking, manner, way, SSL, impose, steal, reveal, infection, virus, threat, trojan, bomb, attack.
Scalability	scale, add, accommodate, include need, increase, release, market, country, country, state, capable, supporting, new, current, customer, user, year, processing, number, grow, multiple, database server, expected, remote.
Look and Feel	look, size, color, shape, texture, position, positioned, located, location, pixel, circle, circular, square, clue, visual, scroll, tool, bar, button, icon, image, buttons, icons, menu, comply, meet, confirm, guideline, standard, display, show, illustrate, simulate, feel, sound, announce, view, grid, graphics, animation, tabbed, schema, attractive, offensive, ethnic, nomenclature, GUI, drilldown, interface.
Usability	show, display, provide, find, locate, icons, tool, tools, toolbar, image, able allow, use, user, customer, scroll, map, web, navigate, navigation, system, friendly, convention, help, ask, section, offer, customize, customization, quickly, easily, quick, easy, understand, entirely, click, select, learn, translate, language, languages, intuitive, feeling, happy, satisfied, content, free, access, accessibility, handicap, disability, one, click, familiar, self-supporting, explanatory.
Performance	perform, check, handle, every, within, second, process, processing balancing, large, simultaneously, parallel, load, response, throughput, lead, cycle, respond, minimum, fast, time, speed, rate, increase, more, high, performance, access, minute, seconds, minutes, space, memory, resource, utilize, utilization, depend, upon, later, returned, asynchronous, asynchronously, overhead, synchronize.
Maintenance	update, maintain, modify, add, integrate, remove, delete, change, replace, upgrade, easily, easy, new, different, release, updated, operate, maintenance, highly, maintainable, configurable, manage, management, function, functionality, component, module, record, data, information.
Operability	operate, exchange, interface, API, APIs, with, without, through, compatible, window, system, os, manage, format, information, data, utilize, run, current, currently, existing, equipment, environment, use, protocol, network, operated, condition, database, store, programming, language, connectivity, evoked, command, platform, prompt, service, stream, navigation, operable.
Portability	portable, portability, support, run, mobile, laptop, tablet, platform, window, os.