The phrase "a second requirement is" is correct and usable in written English.
You can use it when introducing an additional condition or criterion in a list of requirements.
Example: "In order to complete the application process, a first requirement is to submit your resume, and a second requirement is to provide references."
Alternatives: "another requirement is" or "a further requirement is".
Although this study emphasis on qualitative research for the formulation of key concepts and operationalization; another important requirement is the availability of a requisite data, and it is rather problematic in general for the formulation of key concepts and operationalization, a second requirement is the availability of a requisite data, and this is still rather problematic in general.
A second requirement is that retinotopic responses can be modulated by postural information.
A second requirement is a simple algorithm for ranking patients on how relevant a gene-set is.
A second requirement is that current context must determine behavioral significance.
A second requirement is to have some means of separating the learning and the decision phases.
A second requirement is for minimal expression level in the normal tissue, to avoid autoimmune complication.
A fourth requirement is a set of rules determining the frequencies and sizes of the prizes.
A first requirement is the provision of better data on house prices, rents and new construction to improve market transparency.
A third requirement is that the individual whose consent is being sought is actually able to accomplish the decisional task at hand; in other words, they must have the ability to make that particular decision.
A first requirement is certainly that the sequence is sufficiently hydrophobic to become self-interacting (cohesive).
To make BLAST databasse indexing feasible in production, a first requirement is that the amount of memory used by the index data structures should be reasonable.
