PARALLEL AGILE - FASTER DELIVERY, FEWER DEFECTS, LOWER COST IBD

Sinopsi

From the beginning of software time, people have wondered why it isnâÇÖt possible to accelerate software projects by simply adding staff. This is sometimes known as the 'nine women canâÇÖt make a baby in one month' problem. The most famous treatise declaring this to be impossible is Fred BrooksâÇÖ 1975 book The Mythical Man-Month, in which he declares that 'adding more programmers to a late software project makes it later,' and indeed this has proven largely true over the decades. Aided by a domain-driven code generator that quickly createsádatabase and API code, Parallel Agile (PA) achieves significant scheduleácompression using parallelism: as many developers as necessary canáindependently and concurrently develop the scenarios fromáinitial prototype through production code. Projects can scale by elastic staffing,árather than by stretching schedules for larger development efforts. Schedule compression with a large team of developers working in parallel is analogous to hardware acceleration of compute problems using parallel CPUs.PA has some similarities with and differences from other Agile approaches. Like most Agile methods, PA 'gets to code early' and uses feedback from executable software to drive requirements and design. PA uses technical prototyping as a risk-mitigation strategy, to help sanity-check requirements for feasibility, and to evaluate different technical architectures and technologies.Unlike many Agile methods, PA does not support 'design by refactoring,' and it doesnâÇÖt drive designs from unit tests. Instead, PA uses a minimalist UML-based design approach (Agile/ICONIX) that starts out with a domain model to facilitate communication across the development team, and partitions the system along use case boundaries, which enables parallel development. Parallel Agile is fully compatible with the Incremental Commitment Spiral Model (ICSM), which involves concurrent effort of a systems engineering team, a development team, and a test team working alongside the developers.áThe authors have been researching and refining the PA process for several years on multiple test projects that have involved over 200 developers. The bookâÇÖs example project details the design of one of these test projects, a crowdsourced traffic safety system.