Hide / show column in SSRS using parameter

In SSRS reports you can easily determine which table columns are visible by default.  Not everyone knows that you can give user possibility to choose which columns should be visible.

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Essential UML diagrams in software specification

UML notation allows you to use a lot of diagrams that help you to prepare a complete software specification. After several years and projects working as a business analyst I want to point out those diagrams that I think are necessary and sufficent. I will not describe how to create individual diagrams (there is a lot of theory, examples, templates in the web) , but what are their goals and advantages.

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