In my current company, they are using Waterfall methodology in defining the gateways for new project approval and developing detailed timeline with completion date (gantt chart) based on the deliverables identified in the foundation phase.

For the development execution, we are using a hybrid software development process - DSDM / Scrum / Kanban - not defined exactly but using agile practices of each methodology.

How to make - Scrum or any other agile processes - work, where the project scope is defined up front, duration is 4-6 months and with defined release deadlines?

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    Can you explain what you think would be the obstacles? What problems do you perceive? "How to make it work" is way to broad, whole books have been written about that. – nvoigt Mar 11 '19 at 6:12
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    Not going to write a whole answer. In short, you can't. Your scope is fixed. Your deadline is fixed. The only thing you can then flex is resource. Stick with what you are doing. To implement Scrum means changing the culture of your organisation and you don't have the time or the political capital. – Venture2099 Mar 11 '19 at 7:03
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    Scope, schedule, budget...pick any two. You can’t lock in all three, regardless of framework. – Todd A. Jacobs Mar 11 '19 at 15:08

Perhaps the most important question is: why do you want to?

There are a lot of groups out there that they that "Agile Development Practices" will make a traditional project complete faster. While this isn't strictly wrong, it commonly fails - the main reason for this being that without a proper understanding of why different practices work, its hard to pick out the ones that will help and ones that will just trip you up if you try to use them in waterfall.

In the interest of answering the question, I'd say you should look into Lean and Kanban. These are pretty compatible with small-batch waterfall projects, but it's fairly likely that they will require significant changes at the management level. You can also look at some of the technical practices you see in XP. Pairing and TDD can chop out some of the waste that naturally arises in software development. Of course, the challenge with these is also that people who are driving dev teams in the manner consistent with strict timelines frequently view these approaches as "inefficient" and fight against them.

Now, if you want to implement a framework like Scrum because the organization really wants to make that switch, then they need to drop the umbrella waterfall structure. Like any other change management, there are broadly two approaches to this. You can change rapidly and remove all of that structure at once. This has the advantage of getting the pain over and done with. Or, you can take small steps - creating small, protected pilots that are not subject to the timelines. Realistically, unless you have some really strong change agents and leadership behind this, consulting with someone who helps organizations through these transitions would probably be very helpful.

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