However, usability is many times poorly addressed because usability requirements often require an additional implementation effort.
In addition to muscular injection of DNA, electroporation would require an additional minute to administer.
All tickets purchased online require an additional fee.
But some analysts think the F.D.A. would require an additional clinical trial testing Erbitux by itself.
Some events are free with museum admission; others require an additional fee that includes admission.
Based on current projections, meeting the need this winter would require an additional $2.5 billion.
Many drives take power straight from the computer, so they do not require an additional plug.
Finally, the report anticipates that the West Side will require an additional 309 megawatts of electricity.
The United Nations estimates that providing clean water and sanitation for everyone would require an additional $9 billion a year.
Listed at $655,000, the house will require an additional $400,000 to $500,000 worth of work.
Senator Schumer said that Mr. Bistricer's latest plan would ultimately require an additional $10 million a year in subsidies.
