How can someone improve his analytical skills?

Improving analytical abilities could be achieved by improving the following:
1- data collection methods
2- data recording methods
3- data classification 
4- data results diagrams
5- Judgment based the resulting information Finally, continuing of practising analysis for real and imaginary cases is essential to improve the analytical skills.

Analytical skills can be improve by controlling of Data transportation and recording it through data sheets and Control Charts and obviously decision making skills to find out what is bottle neck and which problem is need to be eliminated on priority basis