The author reviewed no less than 15 constructs and at least 51 distinct scale items by using 21 empirical studies in the new product development (NPD) literature. These studies did not use the same terminology as the research being undertaken, which leads to "new" findings that are in fact rehashes of previous work.
About "innovation," it is "an iterative process initiated by the perception of a new market and/or new service opportunity for a technology-based invention which leads to development, production, and marketing tasks striving for the commercial success of the invention. [...] This iterative process implies varying degrees of innovativeness and thus, necessitates a typology to describe different types of innovations. [...] It is important to elucidate that an invention does not become an innovation until it has processed through production and marketing tasks and is diffused into the marketplace. [...] Thus, an innovation differs from an invention in that it provides economic value and is diffused to other parties beyond the discoverers" (p. 112).
About "innovativeness," it is a "measure of the potential discontinuity a product (process or service) can generate in the marketing and/or technological process" (p. 113). This discontinuity could be broken into two frameworks: "(a) macro level where the concern is measuring how the characteristics of product innovation is new to the world, the market, or an industry; and (b) a micro level where product innovativeness is identified as new to the firm or the customer.
Basing on these levels (macro/micro) and S-curves (marketing/technology/both), the author categorized the innovation into three kinds: (1) radical innovations, which are innovations that cause marketing and technological discontinuities on both a macro and micro level; (2) incremental innovations, which occur only at a micro level and cause either a marketing or technological discontinuity but not both; and (3) really new innovations, which cover the combinations in between these two extremes (p. 120).
Radical innovations often do not address a recognized demand but instead created a demand previously unrecognized by the consumer. A radical innovation can be identified by the initiation of a new technology and new marketing S-curve (p. 122). Really new innovations are easily identifiable by the criteria that a discontinuity must occur on either a marketing or technological macro basis in combination with a micro level discontinuity. They can evolve into new product lines, product line extensions with new technology, or new market with existing technology. "Incremental innovations will not result in macro discontinuities which are only seen in radical or really new innovations" (p. 123). Because of the iterative nature, imitative products are frequently new to the firms, but not new to the market. All in all, if the market discontinuity is low or the technological discontinuity is low, this leads to low product innovativeness. On the contrary, high discontinuity in both factors leads to high product innovativeness (p. 124).
PS: the distinction between the marketplace and an industry is that the industry is comprised of several different markets. If an innovation is new to the industry, it is new to the marketplace (p. 124). New to the world implies new to the industry and new to the firm.
To use the customer's perspective for identifying products would be liken as letting the customer drive the innovative process of the firm (p. 125).

