Flow – Workflow template based software

Flow is my experiment into workflow template based software.

Rigid software is a pain to customise

I used to work in a company where their source of revenue was from sales of a single software package. This software package was designed to record customer information and then schedule and manage jobs to service the customers equipment. The package was generic in order to fit as many domains as possible. This confused lots of customers because the items they sold weren’t in the language of the customer. For example, instead of selling or maintaining houses and equipment, they’d have to use products and parts, so would refer to houses as products and equipment as parts.

Every day there would be requests for additional functionality, or a change of its behaviour because it didn’t mirror the way they work closely enough. For example, customers sometimes needed to send an email or calculate a field elsewhere after something had been added to the system. If we added an additional step for one customer, it would affect another customer who wanted the opposite Where do you stop when you start to alter the software for one customer but need it to be generic? That is still a problem for my old company.

Like clothes, we need something simple as a general fit to get started, but then as we mature we can get something tailored which would suit us better and be less wasteful.

How would this work? Lets take this example of adding a new customer. We collect the data from a form and store it in the database.

Flow 1

If this was traditional software, after it’s been shipped, the process can’t be altered because the routines are hard coded. What happens if your biggest customer comes to you now asking you to alter this process because it’s important for them to send an email to the Customer Team every time a new customer is added to the system? Looks like you’ve got to go back and recode the software, then ship it with a set of feature toggles so it sends emails:

Flow 2

Imagine if the software we shipped was a system of workflow templates. If a customer wanted an additional custom action, they could add additional steps wherever they needed to. Customers that just wanted off-the-shelf-software wouldn’t need to do a thing, as they’d never make any changes.

Templated actions or their properties could be locked at the discretion of the template developer leaving everything else would open to customisation. Locking actions is only useful when updating the software versions, so an upgrade would update all the standard actions – the ones that were supported, and wouldn’t remove any custom actions. If actions were removed by the developer, this would cause a few merge issues so that needs thinking about.


I think I’d quite like to create a workflow template based solution. I’m going to concentrate on something web based to start with, designed to be portable for any platform. I’m going to write it in C#, and probably hosted in Azure to start with. It’s also going to be designed so it can be taken offline and needs a way that it can be updated, tested, and rolled back.


  • Collecting data
    This would need forms, form templates, and tie in with validation
  • Validating data
    This would be a custom rules engine linked to any step
  • Storing data
    Where do you store data? How do you set this up? NoSQL would be perfect for this. If we were going to store to a relation database, then mappings would have to be maintained.
  • Sending emails (to customer, internally)
    These need lists of emails, HTML templates, etc.
  • Push notifications
    Send info to phones and push enabled devices in real time. That would be neat.
  • Showing information to the user
    If the user is doing something important, or needs to accept a message first, we’d need a way to show it to them.

Right, enough for tonight, back to work in the morning.

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