Book Image

Agile Model-Based Systems Engineering Cookbook

By : Dr. Bruce Powel Douglass
Book Image

Agile Model-Based Systems Engineering Cookbook

By: Dr. Bruce Powel Douglass

Overview of this book

Agile MBSE can help organizations manage constant change and uncertainty while continuously ensuring system correctness and meeting customers’ needs. But deploying it isn’t easy. Agile Model-Based Systems Engineering Cookbook is a little different from other MBSE books out there. This book focuses on workflows – or recipes, as the author calls them – that will help MBSE practitioners and team leaders address practical situations that are part of deploying MBSE as part of an agile development process across the enterprise. Written by Dr. Bruce Powel Douglass, a world-renowned expert in MBSE, this book will take you through important systems engineering workflows and show you how they can be performed effectively with an agile and model-based approach. You’ll start with the key concepts of agile methods for systems engineering, but we won’t linger on the theory for too long. Each of the recipes will take you through initiating a project, defining stakeholder needs, defining and analyzing system requirements, designing system architecture, performing model-based engineering trade studies, all the way to handling systems specifications off to downstream engineering. By the end of this MBSE book, you’ll have learned how to implement critical systems engineering workflows and create verifiably correct systems engineering models.
Table of Contents (8 chapters)

Estimating effort

Traditionally, absolute duration measures, such as person-hours, are used to estimate tasks. Agile approaches generally apply relative measures, especially for large work items such as epics, use cases, and larger user stories. When estimating smaller work items of a duration of a few hours, it is still common to use person hours. The reasoning is that it is difficult to accurately estimate weeks- or months-duration work items, but there is better accuracy in estimating small work items of 1-4 hours.

There are a number of means by which effort can be estimated, but the one we will discuss in this recipe is called planning poker. This is a cooperative game-like approach to converge on a relative duration measure for a set of work items.

Purpose

The purpose of effort estimation is to understand the amount of effort required to complete a work item. This may be expressed in absolute or relative terms, with relative terms preferred for larger work items.

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