No-code, no thought Substrates for simple programming for all

Figure 1. Virtually eliminates your coding load. FLOW-MATIC promotional brochure (1957)

No-code is a hot new topic for programming startups. The idea is to develop a system that allows end-users to do the programming they need without the difficult task of writing code. There are no-code systems for building mobile apps, analysing data and many more.

It is perhaps not a surprise that "eliminating programming load" is not as new idea as some people may think and there is an excellent blog series on no-code history by Instadeq, going back to 1959.

Funnily enough, the 1957 promotional brochure about FLOW-MATIC, a predecessor to COBOL created by Grace Hopper, uses almost the same language that you will find in startup pitch decks today (Figure 1). Of course, in 1957, coding referred to the tedious process of transcribing the desired program to low-level assembler or (more often) directly to machine code and "virtually eliminating your coding load" meant having a symbolic high-level programming language so easy that a reasonably skilled mathematician would be able to use it.

So, is there really anything new about no-code systems? Is it really possible to "eliminate your programming load"? And what would it really take to make some real progress in that direction?

1. Substrates for interaction

If we look beyond buzzwords, what can no-code platforms really attempt to do? To understand this, let me introduce the idea of programming substrate. The idea is that if you have any sort of software system, you can interact with it at multiple levels through multiple different substrates. If you are building a software, you will interact with it through a programming language by modifying its source code. If you are using a software, you will interact with it through some (structured) graphical interface. All of those - code in a language and interactions with a graphical interface - are interactions with different (programming) substrates.

Figure 2. A hypothetical accounting system with substrates for development (source code), configuration (graphical or textual) and use (user interface).

The idea of programming substrates is generalizing the usual distinction between programming a software system and using a software system. This is useful, because there are often more than two different substrates. It is also useful because we can analyze the different substrates in terms of what kinds of change to the software they allow and what is the difficulty of using them.

For example, Figure 2 illustrates different substrates that a hypothetical software for accounting might have. As a user, you interact ("use") with some graphical interface. This is easy, but it only allows limited "change" - you can enter your invoices and get the tax return forms! A more advanced user can also edit system configuration. This may also be graphical or a textual config file. This is harder, but it lets you modify, for example, how the system calculates taxes. Finally, you (or the company that develops the system) can modify the code of the system itself. This is very hard, but it allows changing it in arbitrary ways. You may need this if the government invents a new kind of tax calculation that nobody expected and so it cannot be added just through configuration. This is a pretty obvious example, but it shows some important aspects of programming substrates:

Figure 3. Excel has substrates for entering data (tables), writing computations (equations), scripting (VBA macros) and source code for modifying the system itself, accessible only to Excel developers.

A system with a more interesting structure of substrates is Excel (Figure 3). Note that I separated data entry from writing equations, because many people use it for just recording data. Thanks to macros, Excel has a more expressive substrate that allows greater change, but is also more complex. This also means there is a more notable gap - moving from writing equations to VBA scripting has a non-trivial learning curve.

2. Challenges for no-code

I have two simple programming problems that I worked on recently that would, I imagine, ideally be solvable by a suitable no-code framework. Looking at these illustrates some of the challenges that no-code systems face.

2.1. Case study: Managing Year in Computing admissions

During the pandemic, I was responsible for managing Year in Computing admissions in Kent. Students applied through Google Form, we checked their past studies in an internal system, scheduled Zoom interview with them, sent them an email invitation and a result after the interview. I also occasionally needed to get some report on how many students were offered a place, accepted our offer etc.

Of course, I ended up writing an F# script (and a bit of JavaScript) to partly automate this, but it would be a good case study for no-code, because it is mostly just an integration of existing services (Google docs, email, Zoom). Many no-code automation tools provide integration with those. But there are two problems.

2.2. Case study: Scraping charitable giving data

Another project I was involved with was scraping data from crowdfunding platforms, which we started to do during the pandemic and which resulted in a joint social policy paper (Figure 5).

Figure 5. Charts showing number of fundraisers and amount donated to "foodbanks", following the Covid-19 outbreak. There was a major peak during the first wave, but no significant increase for other waves (with the exception of Christmas period).

This is similarly conceptually simple task. You just need to search for various terms on the platform, iterate over the results and fetch data about fundraiser details, dates and (when possible) individual donations. In reality, it is not as easy:

The question then is, what kind of programming substrates do we need if we want to be able to solve the above problems, as easily as possible (with or without code)?

3. Technical dimensions of no-code systems

We know how to talk about programming languages and their features, but talking about possibly visual, interactive, stateful programming systems has been a challenge. To make this easier, Joel Jakubovic, Jonathan Edwards and myself recently came up with the Technical dimensions of programming systems framework. This is a qualitative framework that defines a number of dimensions that can be used to describe programming systems. For example, the "feedback loops" dimension describes how a system provides feedback to the developer or a user (in Excel, there is, for example, a live loop when editing values in a sheet or a less immediate error checking when editing equations or VBA scripts).

Several technical dimensions are highly relevant for no-code systems:

You should check out our Technical dimensions framework for more ideas, but the three dimensions above are a good structure for three thoughts I have on no-code programming platforms.

3.1. Notational structure and HyperCard

HyperCard is not a no-code platform, because it does let people write code in HyperTalk (and besides, it was created some 30 years before no-code became a buzzword), but it has been amazingly successful at allowing non-experts create programs. It also has a very clever way of structuring its programming substrate. In HyperCard, you design your cards in a WYSIWYG editor and you can attach behaviour to elements. You can specify that a button links to another card without coding, but more advanced interactions require HyperTalk.

There are still two substrates. The software itself is written in another language (it is not self-sustainable, except for its documentation which is a HyperCard stack) and there is the visual HyperCard environment itself. However, the visual environment is structured in terms of several user levels (Figure 6) that gradually unlock more advanced features of the system. These add further notations (like HyperTalk code), but they still live within a single substrate.

Figure 6. Choosing a user level in HyperCard. Each level allows the user to access more advanced editing or programming features.

Figure 7. Different user levels have different notations, but are accessible from a single substrate - the HyperCard user interface.

The nice aspect of this is that it makes the learning process gradual. As illustrated in Figure 7, you start by browsing, move to editing text and design, then unlock capabilities for adding new cards and only then move to writing code. This somewhat reduces the gap (as, e.g., between the Excel substrates) that you need to bridge if you need more complex change, because you are staying in the same substrate, albeit you get access to more complex features it provides. It also means you do not get overwhelmed by all that is available, as more advanced features are initially hidden. In the programming languages world, Racket follows the same model with its How to design programs teaching languages.

3.2. Self-sustainability and open systems

Despite the interesting notational structure, HyperCard is not self-sustainable meaning that it cannot be modified from itself. It is an application (apparently written in Apple Pascal!) and if you want to change it, you have to modify its source code.

How is this relevant for no-code platforms? The more self-sustainable a system is, the more you will be able to do from within itself. This may not matter much when you are just integrating a couple of services. But as my case studies illustrated, there are always exceptions and cases the platform developers couldn't have thought of. If the system can be modified, it makes it possible for a user to gradually become programmer. (And also to develop a shared open ecology of function that takes care of the scaling issue I mentioned earlier.)

The idea that the user can gradually become programmer exists, for example, in Smalltalk (from User-oriented Descriptions of Smalltalk Systems):

[T]the new user of a Smalltalk system is likely to begin by using its ready-made application systems [...]. After a while, he may become curious as to how his system works. He should then be able to "open up" the application object [...] The next thing the user might want to do is to build new systems similar to the one has been using. Finally, the expert user will want to make his own ["kits" for building such systems].

The substrate for a fully self-sustainable system needs to allow making both small and large changes. As discussed earlier, small changes can be easy, but large changes will inevitably be hard to do. This is illustrated in Figure 8, which shows the possible range of programming substrates and Figure 9, which shows what we would ideally like to get.

Figure 8. Programming substrates can make small changes easy, but large changes will inevitably remain hard.

Figure 9. Ideal substrate makes sure that making a small change is easy rather than hard.

The issue with self-sustainable systems is that they are generally quite hard to use. In Smalltalk or Lisp Machines, you have to master a real programming language before you can do pretty much anything. In other words, the programming substrate is in the upper region of my chart and making even a small change is hard. The point of no-code platforms is to make smaller (to medium) changes easy. A perfect system would have a programming substrate shown in Figure 9. This would make small changes easy by design, but allow gradual progression to more complex ways of working that are necessary for larger changes. (I have no idea how to do this, but HyperCard seems like an interesting option!)

3.3. Limits of automation

Systems like FLOW-MATIC that I opened this post with were called "automatic programming systems" in the 1950s and 1960s. They eventually turned into programming languages, but the hope at the time was that you could gradually automate programming to a greater and greater degree. Today, this is again a hope of many who are trying to make programming "easier", especially with the idea that machine learning can magically do our work.

There are certainly areas where this has worked well, like programming by example in the case of Excel FlashFill. David Canfield Smith, who created the visual Pygmalion programming environment in 1975 is one of those who recognized the danger of this approach:

[T]here is a danger in [automatic programming], if carried too far. By making the computer into a "black box" that does the actual programming, the user has to think less about the logical structure of the problem. [...]

If successful, automatic programming systems will replace some fairly high-level thinking processes in humans. Instead of encouraging humans to do more and better thinking, automatic programming may encourage humans to do less and poorer thinking.

Pygmalion was an interesting system, because it tried to make programming simpler, but without automating it. The approach - now known as "programming by demonstration" was to instruct the computer how to complete task by showing the necessary steps that the computer would then mechanically repeat.

4. Research directions for no-code

I introduced the idea of programming substrates and talked about our work on technical dimensions, because these provide useful framework for thinking about the main question of this post - what would it take to make some real progress towards making programming easer?

Now, I have not looked at every single no-code platform out there. There are certainly many interesting and innovative ideas in the ones I looked at and I'm sure there are more in those I do not know. But I also think that there are some fundamental limits.

To conclude, I think the big open question is how to create a programming substrate that is simple enough for small changes, but embodies the potential for large changes.

To a limited extent, HyperCard does this well by having all authoring tools embedded in an environment that looks the same way as the running program. This makes it easy for users to gradually discover more advanced capabilities of the system. Could something like this be more visual and more self-sustainable?

I also think the issue with "code" is quite different than what people usually think. It is not that "code" is somehow inherently complicated. People find it scary but if they actually try it (and get decent user experience), they are able to work with code (at least, that was my conclusion from some empirical experiments I did using The Gamma). The issue is that it is very difficult to connect code to what we actually see happening on the screen. And this is a problem regardless of whether the code is textual or uses some visual programming language.


Some of the ideas in this post are from a critique of a paper Anatomy of interaction by Antranig Basman, Philip Tchernavskij, Simon Bates and Michel Beaudouin-Lafon from Salon des Refusés workshop. Discussions with Antranig, Philip and also Jonathan Edwards and Joel Jakubovic contributed to the ideas here (but they would probably disagree with many things I'm writing!) Parts about Pygmalion and Smalltalk were also influenced by ongoing work on notations as part of the PROGRAMme project, especially with Liesbeth De Mol.


  1. No-code history - Instadeq Blog - No-code Data Analysis & Interactive Visualizations
  2. Introducing a New Language for Automatic Programming Univac Flow-Matic
  3. Fred Brooks - The Mythical Man-Month: Essays on Software Engineering
  4. Peter Taylor-Gooby, Tomas Petricek and Jack Cunliffe - Covid-19, Charitable Giving and Collectivism a data-harvesting approach. Journal of Social Policy, 2021
  5. Joel Jakubovic, Jonathan Edwards, Tomas Petricek - Technical Dimensions of Programming Systems. Submitted, 2022
  6. Sumit Gulwani, William R. Harris, Rishabh Singh - Spreadsheet Data Manipulation Using Examples. Communications of ACM, 2012
  7. How to Design Programs Teaching Languages - Racket
  8. Colin Clark and Antranig Basman - Tracing a Paradigm for Externalization: Avatars and the GPII Nexus
  9. User-oriented Descriptions of Smalltalk Systems - Byte, August 1981
  10. PYGMALION: A Creative Programming Environment - David Canfield Smith
  11. BOXER: A Reconstructible Computational Medium - Andrea di Sessa, Harold Abelson
  12. Critique of ‘An Anatomy of Interaction’ - Tomas Petricek
  13. An anatomy of interaction: co-occurrences and entanglements - Antranig Basman, Philip Tchernavskij, Simon Bates, Michel Beaudouin-Lafon

Published: Thursday, 28 April 2022, 11:37 AM
Author: Tomas Petricek
Typos: Send me a pull request!
Tags: academic, research, programming languages