Account creation user experience/Launch

Productization notes for the account creation user experience] work by editor engagement experiments.

Comparing A/B test results
Summary:


 * ACUX-1: increase in conversion by 1-2%, which would lead to ~150 new accounts a week depending on seasonality.
 * ACUX-2: results pending. The purpose of this test was to measure how much we gain or lose from adding the benefits section. We expect no more than a 5% difference either way, but we could be surprised.
 * ACUX-3: results pending. While the 1-2% improvement of ACUX-1 was good enough to productize the design improvements, the amount of effort that must go in to making the client-side validation and associated API is much larger, and therefore we expect much better gains if we're going to expend that effort.

Productization options
We're not going to leave the old form, however, which version of the new form we productize will depend on the results, compared above. Here are our two options, based on consensus in the team.

Option 1: full productization incl. clientside validation and API
If we see an increase of 10% or better, then we will productize the version of our account creation improvements which include client-side validation and an API. This would result in 300-400 additional registrations a day, or 2,000-3,000 a week (depending on seasonality).

Option 2: new design, no validation updates, hand-off API
If we see conversion gains less than 10%, we will productize the version with reduced scope, which modernizes the site's design, but doesn't change the validation. This will still give us improved numbers of registrations per week, but will require far less work to productize. We will not completely abandon our API work however, and will hand off ownership to the mobile team, who will require it to add signup to MobileFrontEnd.