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Video Title: E-Type Software Evolution
Description: E-Type Software Evolution
Watch more Videos at https://www.tutorialspoint.com/videotutorials/index.htm
Lecture By: Mr. Arnab Chakraborty, Tutorials Point India Private Limited
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E-type software evolution.

In the previous video, we have discussed
that layman divided softwares into mainly

three different categories.

So, the first category was static type and
it was denoted by S-type.

The next category was practical type,
which is also known as P-type.

And the last category was embedded type,
also known as E-type.

So, in this particular session we are
discussing E-type software evolution.

So, now let us go for the further
detailing.

Layman has eight laws for this E-type
software evolution.

So, what are the eight laws are there?

The first one, continuing change.

An E-type software system must continue to
adapt to the real world changes else it

becomes progressively less useful.

Change requests will be coming from the
client, from the users and those change

requests has to be, they are to be
implemented in the software.

Otherwise, in the long run, the software
will become useless.

Increasing complexity.

As an E-type software system evolves, its
complexity tends

to increase unless work
is done to maintain or reduce it.

Allowing it time, the complexity of the
software will increase.

So, you should have to do some preventive
measures, some actions are to be taken to

maintain it and to reduce it.

Next one is the conservation of
familiarity.

So, what is the conservation of
familiarity?

The familiarity with the software or the
knowledge about how it was developed and

why was it developed in that particular
manner, etcetera.

So, they are to be preserved and
conserved.

Must be retained at
any cost to implement the

changes in the software
in the coming days.

So, all why this particular software has
got developed in this way and how it has

got developed in this way, all this
knowledge must be kept, must be stored.

So, that this conservation will be
required, this conservation of familiarity

will be required in the coming days to
execute any kind of change request.

Continuing growth.

In order for an E-type system intended to
resolve some business problems,

its size of implementing
the change grows

according
to the lifestyle change of the business.

So, that is intended to resolve some
business problems.

So, now you
see its business, the lifestyle, the new

wing may get
introduced in the existing business.

So, as a result of that whenever a
particular software is going to implement

those changes, the volume of that
implementation of change will be directly

proportional to the lifestyle change of
the business.

Reducing quality.

An E-type software system declines in
quality unless rigorously maintained and

adapted to a changing operational
environment.

Change is inevitable.

So, change will be coming.

So, we should be doing continuous
maintenance.

We should be keeping our software in
continuous monitoring and control.

So, that we can maintain its complexity
throughout same.

Feedback systems.

The E-type software systems constitute
multi-loop, multi-level feedback systems

and must be treated as such to be
successfully modified or improved.

So, depending upon the feedback obtained
either using multi-loop or multi-level

feedback systems, the feedback has to be
considered, they are to be unanalyzed and

the changes are to be brought in the
respective software.

Self-regulation.

E-type system evaluation processes are
self-regulating with the distribution of

product and process measures close to the
normal.

That means, this particular point is
indicating that this particular changes,

this aspect follows the normal
distribution.

Organizational stability.

Activity.

The average effective global activity
rate in an evolving.

E-type system is
invariant over the lifetime of the product.

So, these
are the eight different laws Lehman

suggested on this
E-type software evolution.

Thanks for watching this video.

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