Lean product development focuses on delivering value to customers through efficient processes. The four key lean principles are: 1) Specify value by defining what delivers usable features to customers, 2) Identify the value stream through mapping each development activity, 3) Encourage continuous flow between activities without wait times, and 4) Implement pull-based development by prioritizing features requested by customers.

1. Lean in Product Development
Lean comes from Lean Manufacturing and is a set of principles for achieving quality,
speed & customer alignment (same as what we’re trying to do with agile
development, right?), I will attempt to relate this to software development world.
What is Lean?
It’s balanced use of people, equipment and material that gives the lowest
development cost.
The 4 Lean Principles
1. Specify Value - It is the deliverable to client which is usable or the specific
customer/Productneeds at a specific time.
2. Identify the value stream – The specific activities required to design,
develop and deliver the productinto the hands of customer.
3. Flow – Oncewe start the activity there should not be wait time till it is
completed, the activity/task should be completed without interruption.
a. Type 1 Muda (Waste) - Features which do not create value but are
required to deliver the solution
b. Type 2 Muda (Waste) - Features which do not create any value as
perceived by customer and can be remove fromimmediately to do
list.
4. Pull – Pull simply means that no functionality needs to be developed unless
customer asks for it and it is of high priority. In contrastthe Push system
develops regardless of demand. Ex: Kanban