Tables :: Task Tracking For Making Item

Im trying to create a database to track who worked on what item and on what date, with four tasks required to complete the item.To give an example:I have a factory that builds Lego models, for each model there are four steps:

1)Unbox Parts
2)Sort Parts
3)Build
4)Check build

Any employee can work on any task, and multiple tasks can be done by the same employee.Having a completed item table with a field for each task, and a date for each task, with one to many relationships from employee id to each task type. This failed as I needed many to many, so I made a junction table to link them, and this is where I get a little muddled.

Do I need a table of task types, then a table tracking each task to feed into the item table, or is there a simple solution I'm overlooking?