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Spec - Do you keep your PBIs smaller than 2 days' effort?
  v17.0 Posted at 1/11/2017 4:45 AM by Tiago Araujo
Avoid monolithic Product Backlog Items (PBIs). Ideally, all PBIs should be less than 2 days. If you are given a feature that is going to take weeks, then split it following this rule.

Subject: Create an MVC prototype with web services

Figure: Bad example – This is a monolithic 4-day task

Email #1 Subject:  MVC prototype - Create a web page with firstname and lastname textboxes, a save button (and remmed out code to later call a web service)

Email #2 Subject:  MVC prototype - Create a table for customer with firstname and lastname and any other fields required for this table

Email #3 Subject:  MVC prototype - Create a web service with the customer CRUD methods
Silverlight prototype - with firstname and lastname textboxes, a save button (and remmed out code web service)

Email #4 Subject:  MVC prototype - Create methods on webservice exposed to client
MVC prototype - with firstname and lastname textboxes, a save

Figure: Good example – The same monolithic task, broken down into 4 smaller tasks

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