Logical data modeling is one of my tools of choice in business analysis and requirements definition. That’s not particularly unusual – the BABOK (Business Analysis Body of Knowledge) recognizes the Entity-Relationship Diagram (ERD) as a business analysis tool, and for many organizations it’s a non-optional part of requirements document templates.
In practice, however, data models in requirements packages often include many-to-many relationships. I’ve heard experienced data modelers advocate this practice, and it unfortunately seems consistent with the “just enough, just in time” approach associated with agile culture.
In my experience unresolved M:M relationships indicate equally unresolved business questions. The result: schedule delays and budget overruns as missed requirements are built back in to the design, or the familiar “that’s not what we wanted” reaction during User Acceptance Testing (UAT). Continue reading →
Asking fact questions in technical interviews is like eating a donut, feels great at the time but not so satisfying later.
Let’s say the interview consists of facts like this “softball question”: “What is the default port number for SQL Server?” The linked list of questions is a really good high level study guide for a SQL Server student. If a SQL Server developer candidate answers all correctly, then the interviewer can be confident that the candidate knows a lot about SQL Server.
However, few development jobs require only technical fact knowledge. Typically, developers must apply creativity when working with unclear or poorly expressed requirements under tight schedules. They must be versatile so that they can take on unforeseen roles in case of resignations or transfers of team members. If you make an investment in an individual by hiring her or him, you’ll look for a return in the form of professional development as the individual grows their skills.
So how do you test creativity, versatility, and ability to learn, while still gauging raw technical talent? My method is to ask opinion rather than fact questions. Continue reading →
How does this sound as advice for an app dev manager leading his or her team from waterfall to Agile?
Clearly articulate a compelling end-state vision
Work from a position of authority
Weather the storms
Reward creativity while fostering improvement
A post at scrumsource.com lists leadership, organizational culture, and people as three of the five key factors in making the transition. Another at the Scrum Alliance site describes the transition as a migration from externally-organized to self-organizing teams. In my experience the transition requires leadership by a strong advocate who shows the way to willing, empowered team members.
The US men’s national soccer team (USMNT) is playing out a strikingly similar transition. Continue reading →
Out of curiosity I recently reviewed articles critical of Agile Methodologies. I had expected agile-versus-waterfall arguments and attacks from vendors selling new alternatives, but even given the reputation that advocates have for flaming well-intentioned critics, I wasn’t prepared for the level of emotion I found.
My opening position was that Agile techniques are great, but like any other tool there are limits and prerequisites. The critical articles I read strengthened that view. Let’s review three examples that stood out, in reverse order: Continue reading →
As important as it is, data modeling has always had a geeky, faintly impractical tinge to some. I’ve seen application development projects proceed with a suboptimal, “good enough”, model. The resulting systems might otherwise be well-architected, but sometimes strange vulnerabilities emerge that track directly to data design flaws.
Recently I saw an example where a “good enough” data design, similar to the one pictured, enabled a significant application bug.
Recently the BBC posted this video. On first view it is just funny, but watching those dogs learn to drive really reminded me of personal experiences with IT teams making big learning transitions. To represent those real situations let’s consider a fictional team of SQL developers facing the daunting task of deploying a functional Hadoop-based analytics prototype in two months. The video parallels their critical learning success factors: (1) set audacious goals, (2) learn bit by bit, and (3) know your limits.
Recently I was in a conversation about data modeling standards. I confess that I’m not really the standards type. I understand the value of standards and especially how important it is to follow them so others can interpret and use work products. It is just that I prefer to focus on understanding of the principles behind the standards. In general, it seems to me that following standards is trivial for someone who understand the principles, but impossible for someone who doesn’t. But there doesn’t seem to be general understanding of data modeling principles. Continue reading →
In my experience, some BI projects ultimately finish as a success, but exceed budget and schedule targets and fall short of functional goals along the way. On projects like this, somewhere in the midst of report development, things get sticky and tasks fall behind schedule as the team runs into unexpected complexities. Continue reading →
I’ve written a number of posts about agile techniques of project management on this site, all in a spirit of advocacy. A comment on the most recent reminded me that agile/scrum isn’t necessarily the right solution in all situations, and in some it may work but needs to be applied carefully. After that comment I thought it would be interesting to write about situations in which agile methods should be applied with care, if at all: Continue reading →