Scrum Events : Sprint Planning
Agile does not mean no planning. Agile means intense planning - for short time horizons.
The purpose of the sprint planning meeting is to do the intense planning that sets the team up for an effective and efficient sprint.
Sprint planning is the very first activity in every sprint. In the Sprint Planning meeting we identify the volume of work for the sprint (the commit - or forecast) and we create most of the knowable tasks to deliver it (the Sprint Plan).
Maximum duration is a four hour time-box for a two-week sprint (eight hours for a one-month sprint); New teams may find it had to spend that long in planning, and as teams gain mastery the value in a detailed planning session becomes evident, and teams are more willing (and eager) to put in the time required to ensure they can have a smooth sprint.
Sprint planning is where the team makes sure that the FLOW of work in the sprint can move effectively through the process (The devOps 1st way).
Sprint planning is also the meeting where we ensure that we control work in progress (WIP) , because we know that too much WIP leads to slower outputs, lower quality and burnout.
We control too much WIP by ensuring that only the people doing the work (i.e. the development team) can decide how much work will be pulled into the sprint
Only the Product Owner can decide what work the development team can pull into a sprint, because it is the product owners responsibility to make sure that only work of the highest value is committed to.
The development team must pull from the top of the product backlog, only, they cannot cherry pick what work to do.