Archive of Prioritization Articles

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.

In our previous post on Kano requirements classification, we introduced the concepts and showed how to apply them. One of our readers commented privately that we didn’t show how to use the techniques for prioritization. We’ll do that in this post.

We’ve talked before about three ways to prioritize software requirements. We’ve also talked about incorporating risk analysis into ROI calculations for requirements. In this post we will look at how Kano analysis can be applied to prioritizing requirements.

Prioritizing software requirements

Jason at 37 signals recently posted about essential vs non-essential requirements - the software equivalent of Am I hot or not? He talks about the prioritization decisions their team went through as part of bringing Campfire to it’s launch. Campfire is an online collaboration application that just launched today. We will talk about how their prioritization

We’ve talked repeatedly about using ROI to drive prioritization of requirements based upon value. ROI can be used as the basis for prioritization for all decision making.

If we fail to take risk into account, our calculations will certainly be wrong, and we may make a poor decision. When we talk about accounting for risk in this context, we mean that we are accounting for the unlikely, undesired, or unintentional outcomes. We use the term expected value to refer to the risk adjusted approximation of the outcome. In financial circles, this is also called discounting.

The most common mistake people make when calculating ROI is failing to take into account the expected value of the return or the expected value of the cost of a project.

Now that we’ve gathered all these requirements, how do we determine which ones to do first?

The less we know about our client’s business, the more the requirements appear to be equivalent. We’ll talk about three different approaches to prioritizing requirements.

1. Classical. Let stakeholders assign priority to the requirements.
2. Exhaustive. Explore every nuance of prioritization and its application to requirements.
3. Value-based. Let ROI drive the decisions. (hint: this is the best one - scroll down if you’re in a real hurry)
4. [bonus]. A look at how 37signals prioritizes features for their products.