Pay-for-time projects have been experiencing double and triple-digit monthly growth since they were introduced in mid-2009. This model is backed up with the vWorker.com "AccuBilling money-back guarantee". It has many advantages over pay-for-deliverables including: handling larger projects and repeat business better, requiring less up-front time and effort for both parties, five to ten times less chance of project failure (1-5% versus 11-27%), and being 28-40% cheaper. For that reason we recommend pay-for-time in many situations when you're hiring a worker for the first time, as well as all repeat work with that same worker.
 

17820
	Apr 2010 Hold cursor still over the center of any bar to see it's value Apr 2012

Average Monthly Growth Rate: 33.16%
Average Yearly Growth Rate: 397.96%

Show numeric data

Date	# of billable hours
Apr 2012	17,820
Mar 2012	13,508
Feb 2012	11,597
Jan 2012	9,863
Dec 2011	10,682
Nov 2011	11,746
Oct 2011	10,849
Sep 2011	10,803
Aug 2011	11,951
Jul 2011	9,173
Jun 2011	10,154
May 2011	9,915
Apr 2011	7,857
Mar 2011	8,027
Feb 2011	6,670
Jan 2011	7,034
Dec 2010	6,119
Nov 2010	5,674
Oct 2010	3,811
Sep 2010	4,100
Aug 2010	3,563
Jul 2010	3,287
Jun 2010	2,806
May 2010	2,429
Apr 2010	1,918

On-the-job trials were introduced in January of 2012. They allow the employer to bypass interviewing and instead find the best worker through either crowdsourcing (for projects smaller than two days) and trialsourcing (for larger projects).
 

137
	Jan 2012 Hold cursor still over the center of any bar to see it's value Apr 2012

Average Monthly Growth Rate: -0.94%
Average Yearly Growth Rate: -11.24%

Pay-for-deliverables projects are backed up with the vWorker.com "Triple-point money-back guarantee". They provide employers with maximum protection and safety, in exchange for paying a little more (28-40% more than Pay-for-time). We recommend this type of project when the employer is working with someone for the first time and they don't fully trust them. Once they establish that trust, we recommend that they switch to pay-for-time for follow-up work (to reduce risk, save money, and work more quickly and flexibly).

The number of pay-for-deliverables projects have predictably declined since pay-for-time was introduced on the site. However, it has been, and will continue to be, a significant percentage of site business...because it is the most secure and protected way to initiate work with a new worker.
 

7601
	Apr 2010 Hold cursor still over the center of any bar to see it's value Apr 2012

Average Monthly Growth Rate: -2.52%
Average Yearly Growth Rate: -30.26%

Show numeric data

Date	# of 100% completed projects
Apr 2012	4,662
Mar 2012	5,229
Feb 2012	5,013
Jan 2012	4,875
Dec 2011	4,894
Nov 2011	5,224
Oct 2011	5,329
Sep 2011	5,547
Aug 2011	6,137
Jul 2011	6,007
Jun 2011	6,170
May 2011	6,386
Apr 2011	6,365
Mar 2011	7,039
Feb 2011	6,383
Jan 2011	6,497
Dec 2010	6,417
Nov 2010	6,821
Oct 2010	6,899
Sep 2010	6,777
Aug 2010	6,948
Jul 2010	6,960
Jun 2010	6,916
May 2010	7,422
Apr 2010	7,601