The increase is made up of a percentage of the cost of living. Today in order to keep a handle on inflation, you are now only compensated for part of the COL rise and that only once every three months. If the rate is low then you get no tosephet yoker. Once you get your tosephet Yoker it then goes into your base salary. There are two types of levels, one for non-academic and the other for academics.
Most positions have a floating level.
For example, a supervisor of a division may be between a 8 and 10, while a departmental director may be between 9 and 12. Many Government departments have their own rating of levels. Once you have risen your maximum level you can only get a higher level if your job description changes. The other parts of your salary which are negotiable are car allowance and overtime. This determines who pays for your insurance and test.