We’ve studiously avoided talking about requirements for expert systems because it is such a small niche of software development. Please let us know in the comments on this post if this is an area you would like to read more about. This post is both a discussion of the main barrier to success for these systems and an introduction to future posts if you ask for them in the comments on this post. Expert systems, or AI programs can solve some of the hardest problems. Yet AI software has not dominated the software landscape, neither Heinlein’s nor Vinge’s fictions have become real. Why has AI software failed? It isn’t that the hardest problems are too hard to solve, it’s that they often don’t need to be solved at all.
Interaction design / Requirements / Requirements Models / Software development / Software requirements specification / Use Cases / UX
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Interaction Design and Structured Requirements
subtitle: Wiegers and Cooper assimilated
Wiegers promotes structured requirements. Cooper touts Interaction Design. Both have great ideas. Both “wave their hands” at parts of the process. In this post, we’ll talk about how to combine the two philosophies to get the best of both worlds.
Interaction design / Prioritization / Software development / Software requirements specification / UX
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How To Create Personas for Goal Driven Development
We mentioned the creation of personas in our overview of the interaction design process. In this post we will talk in more detail about how to create them. We will cover identification and prioritization of the personas, defining the corporate and personal goals for the personas, and creating the anecdotal stories that give each persona an identity against which we can make design decisions. Scenarios are also defined for the primary personas, which drive the creation of the functional requirements specification.
Design / Interaction design / Requirements / Requirements gathering / Software development / Software requirements specification / UX
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Interaction Design Process Overview
Interaction design, as described by Alan Cooper in The Inmates are Running the Asylum, is a process for designing software by focusing on the most important users. Unlike traditional requirements gathering and solution design processes, interaction design focuses on the goals of a specific class of users, represented as a persona. Those goals are considered when defining scenarios that represent how the primary persona will use the software. The combination of goals and scenarios leads to design artifacts and a functional specification. We will explore these steps in more detail in this post.
Agile / Design / Interaction design / Outsourcing / Requirements / Software development / UX
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Software design and specification and making movies
Alan Cooper presents the analogy that software development is like making movies in his book, The Inmates are Running the Asylum. Cooper is presenting the analogy in the context of validating the business case for investing in interaction design, but it holds true for requirements as well.
Foundation series / Software development / Test Automation / Testing
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Software testing series: Pairwise testing
Very large and complex systems can be very difficult and expensive to test. Often, we inherit legacy systems with multiple man-years of development effort already in place, in the field and of unknown quality. With these systems, there are frequently huge gaps in the requirements documentation. Pairwise testing provides a way to test these large, existing systems. And on many projects, we’re called in because there is a quality problem.
Marketing / Requirements / Software development
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We must sell the software first
We write a lot about value-driven prioritization of software requirements. It’s easy (when defining requirements) to forget that we have to sell the product before anyone gets any value from it. With internal use software for large companies (like enterprise software, intranets, erp systems), “sell it” means “get high user adoption rates.” High user rates are key to getting ROI when process-improvement is one of the targets of the software.
Project Management / Requirements / Software development
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Managing scope creep is not a zero-sum game
We’ve never had a project where we didn’t have to address scope creep. As a supplier, we prioritize loyalty and relationships above incremental profitability. Project management techniques for addressing scope creep do us a disservice by starting with the presumption that resources have to be managed in a zero-sum game (every new feature must displace an existing feature). In this post we will talk about the opportunity to strengthen the relationship with our customer as part of addressing scope creep. It is not a zero-sum game.
CMMI / Process Improvement / Software development
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What CMMI level should we use?
The CMMI (Capability Maturity Model Integration) of a software development process is the measure of that process’s capability. The goal of the measurement is to provide an assessment of the capability of a process with respect to creating software. Our foundation series post on CMMI provides background information, while this post focuses on the danger of misusing CMMI ratings.