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directory and mandatory
essential:must have desirable:you have
"Mandatory" implies that something must be done or is required by a rule or law. "Necessary" suggests that something is needed or essential for a particular purpose or outcome. Essentially, something that is mandatory is always necessary, but not everything necessary is always mandatory.
an essential skill is something you need and a desirable skill is something you want
A mandatory relationship is when you HAVE to do it. Kind of like when people are "arranged". An optional relationship is where you have the right to chose.
"requirement" is nothing but the raw data gathered from the customer what he wants. "requirement specification" is a document which specify the requirements.
Indian pharmacopoeia is mandatory in India for registering medicinal products and British pharmacopoeia is mandatory in MHRA.
The difference between desirable and essential is... essential is a MUST have where as... desirable is something someone would LIKE you to have. For example; in a job description it may have A-C in GSCE Maths as an essential because they are saying you MUST have this but it may say a current driving licence is an advantage which it could then say desirable next to it as they would LIKE you to have this but it is not a must hope this helps... from Charley
Deped Memo is a reminder or a communication for a certain employee which can be followed or not but an order is something mandatory.
Sounds similar but a preference is desirable only, not required.
just refer to class 11 NCERT text books
Yes, there is different between requirement and analysis phases. In Requirement phase requirements are gathered and in analysis phase gathered requirements are analysed.