is it flexible?
Yes, the constitution has deliberately been worded in generalities to ensure its flexibility.
Constitution of India
The constitution has deliberately been worded in generalities (not in vague terms) to ensure its flexibility. 
who said the principles should be made the basis of all future legislation Dr. Ambedkar when was it implemented? 2002 any one reason behind its implementation? Social Justice any one of its features? It aims to create social and economic conditions under which the citizens can lead a good life. did it amend anything? No, but if changes had to be made in the principles it would require a Constitutional amendment. what do you mean by this last term? It is a modification of the constitution of a polity, organization or other type of entity. how is it related to our country? The procedure to amend the Constitution of India is detailed in the Article 368 under Part XX of the Constitution. the indian counterpart you had mentioned just now, when was it adopted? 26 November 1949 was any assembly created for that? Yes, a constituent assembly. when was the draft made for it? The initial draft was prepared in February 1948 by Rau, it was then redrafted on 4 November 1947. can you state one of its limitations? It cannot destroy what it seeks to modify. which person or group or organization framed it? Kesavananda Bharati v. State of Kerala
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Constitution of India [SEP] Flexibility
According to Granville Austin, "The Indian constitution is first and foremost a social document, and is aided by its Parts III & IV (Fundamental Rights & Directive Principles of State Policy, respectively) acting together, as its chief instruments and its conscience, in realising the goals set by it for all the people." The constitution has deliberately been worded in generalities (not in vague terms) to ensure its flexibility. John Marshall, the fourth chief justice of the United States, said that a constitution's "great outlines should be marked, its important objects designated, and the minor ingredients which compose those objects be deduced from the nature of the objects themselves." A document "intended to endure for ages to come", it must be interpreted not only based on the intention and understanding of its framers, but in the existing social and political context.