The evolution of an act isn't a smooth process but has many released improvements each of which will diffuse in society. If you examine the diffusion curves for each improving version, they generally have different time length and market sizes (i.e. they're not uniform) - see figure 1.
Figure 1 - Diffusion of multiple improving states of an act - from A1 to A5
However, by examining ubiquity of an act and certainty (i.e. how complete, well understood and well defined an act is) then you can measure this progress of evolution - see figure 2.
Figure 2 - Evolution of an act - from A1 to A5
So, if we think of computing infrastructure then :-
- We started with the genesis with the Z3
- We have multiple custom built examples e.g. LEO as companies and individuals explored the potential.
- The act of computing infrastructure evolved (i.e. became well defined and widespread enough) that the first products (e.g. IBM 650) appeared.
- We had multiple waves of ever improving products. Some of these waves disrupted previous products - mainframe, minicomputer, server.
- Overlapping this time, we had the introduction of rental services.
- Computing infrastructure became so widespread and well defined that commodity servers were introduced (volume operations based, highly standardised etc).
- Being widespread, well defined and with a suitable delivery mechanism (the internet) then computing infrastructure became provided as utility services (e.g. Amazon EC2).
Now, it's important to understand that the evolution curve is made from hundreds of diffusing and ever improving versions, some of which disrupted past examples and some which were incremental improvements.
So, where is the chasm in this? There are many chasms not one. If you think back we've had chasms for utility computing, client / server, mini-computing, mainframe and even the original adoption of computing. During this time, computing infrastructure (as in the act) hasn't changed - it's still all about provision of compute processing & storage. Just the mode of operation and delivery mechanism has evolved.
So when you look at the evolution of technology (e.g. figure 2) then there isn't a single chasm. Evolution has many hundreds of diffusing changes involved each with potentially their own chasm. Hence when you think of computing infrastructure then :-
- There was a chasm in the early stages (the original computers).
- There was a chasm when computing went from custom built to products.
- The have been multiple chasms involved with each major product change (mainframe, minicomputer, client/server etc) as the act evolved.
- There was a chasm involved in the introduction of commodity servers.
- There was a chasm involved in the introduction of utility servers.
Fortunately, from a perspective of mapping - there exists only one evolution curve. Which is why we can map a business. Without a single evolution curve then mapping would be impossible (this is why we can't map over diffusion, hypecycle, system of record / engagement etc).