Stefan Zils | Eifel42 on Eifel42

Norway’s sports system, Brailsford’s marginal gains, and Kaizen and Agile methods show how change management succeeds: motivation, interdisciplinary thinking, and small continuous improvements lead to world-class results in sport and digital projects.

Discover the Kaulenbachtal valley: slate mining history, unique microclimate, hiking from Laubach, and the transformation of slate mining communities.

How simulated Sprint overruns, cancellation gates, and budget pressure expose hidden development cost — and why the cheapest feature can carry the steepest relative risk.

A practical look at portfolio risk for software backlogs: the four risk layers — development, market, component, global — and what happens to business value when each one fires.

Business Value Floor 95 for software projects: the 5th percentile of simulated outcomes.

FHS is a small Python library that simulates 10,000 futures per feature hypothesis so Product Owners can prioritise on a numerical decision basis — expected value, Business Value Floor 95, worst case, VaR, CVaR and portfolio balance — built end-to-end as a

Wilde Endert — narrow trails through the lower valley, with gorges, the Rausch waterfall and slate hills.

Dreimühlen Waterfall — short walks for families, longer hikes and bike touring on the Kalkeifel-Radweg in the Eifel.

Ulmener Maar — short hikes, a connecting tunnel to Jungfernweiher and birdwatching opportunities.

Book recommendation: a concise review of Uwe Vigenschow’s ‘Lernende Organisationen’ highlighting practical takeaways for organisational learning.

Discover the medieval castles of Eltz Valley on award-winning Traumpfade hiking trails.

I had the opportunity to participate in the Microsoft AI Tour, and it was exciting to see firsthand the experiences shared from real-life projects, particularly the Zava demo project.

This summer, I embarked on a journey to revise the layout of my blog.

Insights from Developer Summit 2025 in Berlin: DDD, legacy modernization, responsible architecture and AI.

Karabiner Elements makes switching between Mac and Windows environments incredibly easy and is a preferred tool for long coding sessions.

Introducing the Free GDPR Compliance Helper The European Union has introduced an excellent resource: a free GDPR compliance tool. → Discover the tool.

I had the opportunity to participate in Data in Motion Day 2024 in Frankfurt, analyzing stream processing from a business analysis and enterprise architecture perspective.

What is an increment?

Software architecture documentation importance analyzed through historical perspective.

A Java Software Development Conference Javaland Nürburgring (Eifel), 2024 In April, the German Java conference took place at the Nürburgring.