Business Case for ReSharper

Question

We are trying to get ReSharper introduced to our company but it would have to be for all developers. Management want us to justify the cost with a business case.

I am unsure how to go about getting proof that ReSharper will benefit the business. What kind of statistics can you get from it?

Answer 1

I am unsure how to go about getting proof that Resharper will benefit the business.

If they asked for a business case, they're not asking for proof, just some kind of fact-based estimate of the likely return on their investment.

So, for example: A license costs (say) $250 per developer, a developer costs (say) $50,000 per year. A developer with Resharper costs 0.5% more than a developer without Resharper.

That gives you a basic financial model - if you get more than a 0.5% productivity gain, then it's worth it, if you get less, it isn't. Some corporates apply a minimum return on investment (ROI) factor - so if the factor is 1.2, then you would have to show a 0.7% benefit to get approval. The factor is very unlikely to be more than 3.

You could tweak that model - depreciate the license over 3 years, include the procurement costs, changing cost of capital, etc., but a simple, conservative model is likely to have the broadest appeal.

Then all you need is some evidence that you get more than a 0.5% productivity improvement. You could run a benchmark, or a pilot with a small number of developers for this. Pick some typical tasks and time them with and without Resharper. There is a 30 day trial version available so you could run a pilot before you have to purchase.

The PDF on the Resharper home page claims a 35% productivity increase - you can take that with a pinch of salt, but unless that's exaggerated by a factor of 70, it's still a worthwhile investment. The number of recommendations on the web, and developers claiming to buy it with their own money suggest that it isn't a wild exaggeration.

When you present the business case, you might like to illustrate that percentage as a dollar value too.

Developers only spend part of their day in their IDE, so you should probably adjust the expected returns downwards because of that. The real number is probably between 20% and 80%, but the lower end of the range might not be a politically acceptable number to present. You're interested in what proportion of the output is affected by the investment.

I don't have any connection with Jetbrains - and I'm answering a question about how to make a business case, not selling licenses! The anecdotal evidence from where I work is that the developers who have used Resharper have only good things to say about it. In some very specific cases it has saved weeks or months by automating mechanical tasks that have to be applied over a lot of files. The rest of the time it's hard to measure, but since the developers use it all of the time, they must be getting some real value out of it.

There's a quality argument too - you could measure this as a productivity increase, or a cost saving, or just an additional argument - depending on how quality issues are perceived at management level in your company.

Good luck with your business case.

Answer 2

The best business case for ReSharper has to do more with the ability for it, when coupled with StyleCop Add-In (free), to allow a small team of developers to quickly create consistent, coherent, standards-based, maintainable code. Until it was introduced in our organization we had nothing but numerous stylistic approaches, not to mention the defects, bugs and other problems ReSharper helped us identify and correct. It is quite simply the best VS Add-In I've ever encountered.

As an aside, you should pick up GhostDoc (free VS Add-In) as well. It makes documenting your code much easier as well. These two tools together are invaluable.

Answer 3

ReSharper does not track itself in any way that would provide useful statistics. Also, I'm pretty sure no college/company/consultants have any sort of meaningful hard data. This is just too complex. I suppose you could measure the time savings from (A.) code insertion, (B.) refactoring quickly, and (C.) getting it right the first time because ReSharper didn't make the mistakes a human would. Just these savings pays for ReSharper soon enough. For a $300 license, all ReSharper has to do it save you 5-6 hours per developer. That's hours.

But the real benefits of ReSharper are impossible to measure:

• Since good structure is now as easy to make as bad structure, you do it right!
• Your designs are better, because you spend you time thinking about design rather than coding cruft.
• Whatever your level, you learn from ReSharper . The refactorings available are those demanded by top-level developers. By using them you learn these good practices.
• Mistakes are more forgiving. If you structure your code poorly, it's easy to fix. I find myself more daring and willing to try new things, because there is less risk. This has resulted in some great code.

I'm afraid your powers-that-be will need to trust you, or trust the testimonials on the web-site, or trust a consultant, or experience ReSharper for themselves. If your managers are not themselves quality developers, you're going to have an uphill battle. I wish you luck.

I bought ReSharper with my own money a few months ago, because I knew the best developers used it (or coderush). And best means they create more maintainable solutions for less time/money. It has surpassed my expectations. Getting code out there quicker and being able to refactor quicker is what I expected. All well and good. What I did not expect was how this would increase the time I had to make the right development decisions and do the right things at the most efficient time. Before there was just not enough time to do things right; now there is.

So it's impossible to tell management whether ReSharper pays for itself 20 times over, or 100, or 500, but I think 20 should be enough.

Answer 4

An issue you may run into is that Management may not so much be looking for a justification for ReSharper, but justification for those things that ReSharper does: refactoring, code cleanup, increased ability to navigate code, unit test support.

If you've got Management that needs to justify something like ReSharper, then they may not yet have "justified" modern software development practices, either.