U

U.K. Data Protection Act (1998), 75, 292

U.K. Disability Discrimination Act, 170

UML (Unified Modeling Language) standard, 74

unaddable amounts, not sorting on, 270

unaddable data, 262, 270, 271

unapproved actions, storing, 323

unavailability, surreptitious, 221, 224–225, 238

unavailability window, 219

undecipherable form of passwords, 292

Unified Modeling Language (UML) standard, 74

uninstalling, 277, 279

unique identifiers, 98–99

for requirements, 13, F-33, F-36–F-37

scheme for assigning, 97

unique interface IDs, 52

unit IDs for organizations, 329

units, associated with values, 87

Universal Time Co-ordinated (UTC), 90, 92

unknown information, 160

unpaid fees, tracking, 336

unparochialness

content requirements, 256

examples of, 257

extra requirements for, 257–260

specifying, 254–255

templates for, 256

testing, 260–261

unparochialness requirement pattern, 254–261

unsigned numbers, data type, 87

upgrade from any previous version requirement, 277

upgrade instructions, documentation requirement, 83

upgrade requirements for an interface, 59–61

upgrades

as downtime, 225

duration of, 230

frequency of, 229–230

preparation for, 230

scalability requirements and, 245

testing, 278

uninstalling, 277

upgrading, 276

of an interface, 57

specifying requirements for, 277

by versions, 278

urgency of a requirement, F-39

U.S. Rehabilitation Act, Section 508, 170, 175, 186

usability, 168, 169, 175, 185, F-70. See also accessibility

use cases

compared to user stories, F-24

defined, F-13

for requirement patterns, 37–38

writing, F-13–F-14

use case diagram, F-13

users

allocating IDs to, 99

availability of system to. See availability

behavior of, 212–213

counting dynamic, 213

forcibly ejecting, 214

geographic distribution of, 209

limiting number of, 214

number of active, 149

with specific needs, 168, 169, 172, 174–175, 183–184. See also accessibility

as system, 171

wait time warnings for, 203

user access state, specifying, 143

user access via Web browser, 68

user accountability, 282

user actions, 147, 148

user authentication, described, 281, 282

user authentication requirement pattern, 295–305

user authorization

described, 281, 282

inquiry requirement, 317

user authorization requirement pattern, 305–307

user classes, 285

user colors, accessibility requirements, 180

user de-registration, 287, 290

user experiences, distinct, 261, 267–269

user function domain, 29

user function requirement pattern, 155–190

user IDs, requirement for no special, 293

user interfaces

allowing user to adjust to, 175

capabilities, 187, 188

inter-system interface requirement pattern not used for, 52

multiness in, 267

semantic requirements, 178, 186

tailoring for specific needs, 183–184

user interface designer, F-15

user interface infrastructure, 155, 187–189

user preferences, 132–133

user registration, 281, 282

user registration requirement pattern, 284–295

user response time, 196, 201

user roles, 15, 316, F-55

user sessions

allocating, 214

created by authentication, 296

ending, 298, 300–301

viewing, 298, 303–304

user stories, 9, 10, F-24, F-26

user times per time zone, 93

user-accessible information, viewing of, 160

users

blocking, 298, 302–303

details about, 285

performing their own registration, 284

protection of, 298, 301

registering, 284

special processes for new, 287, 293–294

UTC (Universal Time Co-ordinated), 90, 92