What’s agile all about?
Agile methods are – first and foremost – a means for improving the quality of your engineering work products. This is achieved through the application of a number of practices meant to continuously identify quality issues and immediately address them. Secondarily, agile is about improving engineering efficiency and reducing rework. Let’s talk about some basic concepts of agility.
Incremental development
This is a key aspect of agile development. Take a big problem and develop it as a series of small increments, each of which is verified to be correct (even if incomplete).
Continuous verification
The best way to have high-quality work products is to continuously develop and verify their quality. In other books, such as Real-Time Agility or the aforementioned Agile Systems Engineering books, I talk about how verification takes place in three timeframes:
- Nanocycle: 30 minutes to 1 day
- Microcycle: 1–4 weeks
- Macrocycle: Project length
Further, this verification is best done via the execution and testing of computable models. We will see in later chapters how this can be accomplished.
Continuous integration
Few non-trivial systems are created by a single person. Integration is the task of putting together work products from different engineers into a coherent whole and demonstrating that, as a unit, it achieves its desired purpose. This integration is often done daily, but some teams increment this truly continuously, absorbing work as engineers complete it and instantly verifying that it works in tandem with the other bits.
Avoid big design up front
The concept of incremental development means that one thing that we don’t do is develop big work products over long periods of time and only then try to demonstrate their correctness. Instead, we develop and verify the design work we need right now, and defer design work that we won’t need until later. This simplifies the verification work and also means much less rework later in a project.
Working with stakeholders
A key focus of the Agilista is the needs of the stakeholders. The Agilista understands that there is an “air gap” between what the requirements say and what the stakeholder actually needs. By working with the stakeholder, and frequently offering them versions of the running system to try, they are more likely to actually meet their needs. Additionally, user stories – a way to organize requirements into short usage stakeholder-system usage scenarios – are a way to work with the stakeholder to understand what they actually need.
