How to properly categorize it skills?

Question

PHP

Actually a question on behalf of the manager.
How can you correctly and correctly break skills (there is the following list):

PHP, SYMFONY, YII, Zend, SILEX
JAVA (Spring, Maven, Swing, Hibernate, JPA)
JS (ExtJS/Sencha, jQuery, Node.js)
CMS
HTML5, CSS3, COMPASS, SASS, SVG
Delphi, C++, .NET
Responsive design
ORACLE, PL SQL, MySQL, Interbase, MSSQL
Redis, Memcashed, NoSQL, MongoDB
ExtJs / Sencha Touch, Java (J2ME), PhoneGap
PHP Unit, Selenium IDE, Selenium WebDriver, Framework Junit, TestNg

Now there is a task to break it into categories (Kaktgorii need to be invented).
I have some doubts, so to speak, because of which some perfectionists can swear.
For example:
Can you call Redis and Memcashed a database and throw it all into the general category of a database?
Database:

ORACLE, PL SQL, MySQL, Interbase, MSSQL
Redis, Memcashed, NoSQL, MongoDB

As for web development, you can use C++ and Java and so on. What is the right way to break all these things down (referring to web development and desktop development)?
And is it possible to unite all this
PHP Unit, Selenium IDE, Selenium WebDriver, Framework Junit,
TestNg under one name: Development through testing?

Answer 1

Usually, the classification is divided into subgroups:
- By the type of language interpretation / compilation
- By the platform of use
- By the type of storage of records in the database
- By the average salary level
- By the average annual size of teams on enterprises
That is, not just "classification by .. .", but as they say in textbooks: "Classification by the type of virtualization happens ...". And there are already skills associated with each, for example.
Although in general, the usefulness of the idea is doubtful, IMHO

Answer 2

The quantity immediately catches the eye. Do you know all this? For each technology, 500-800 book pages. Have you even read all of them? Is it all right? Is there a demo project for each with 1000+ lines of code?
> vlyakie perfectionists can swear
You yourself are this " every perfectionist". You wrote yourself 100500 skills and you can’t answer any of them.

Answer 3

It depends on the purpose of the classification, you can front-end/back-end or regular projects/highload