Underestimate often enough and your company goes broke. And overestimating sends business to competitors. The difficulty in estimating a design job is partially due to CAD programs. "CAD is a huge multiplier of all the good and bad that engineers do, so the difference between estimated and actual time has the potential to be greater than ever before," says Stephen Samuel, president of Design Visionaries Inc., a product-design firm and CAD software reseller and trainer. He adds that the estimating problem is exacerbated because many people who quote jobs are not necessarily experienced CAD users.
To solve the problem, Samuel's team created the Design Project Estimation Tool (DPET). He says it captures his company's experience and the critical factors related to CAD that determine project schedules.
Users register to receive a password that gives access to the estimator. The software consists of about five input windows, each of which is fairly self-explanatory. The first screen deals with variables such as a single user's skill level. Samuel suggests that estimators know what work will be performed by beginners (slow users), those of average skill, and experts. The calculator is intended to account for the project work of a homogenous staff (all mechanical or electrical) with differences in skill level as accounted for in the first input section. But it seems you could run the calculator once for each skill group. The separate totals would be combined for the aggregate project time.
The Project Planning Phase (the second input screen) asks for estimates relating to initial project work. Built-in factors handle complexity of purchased components.
Part Design and Modeling requires estimates for how many parts must be designed and the complexity of each. Samuel says it's better to slightly overestimate the number of parts if an exact amount is unknown because engineering often takes longer than anticipated. Also, there may be a requirement for more parts than initially expected, or the effort to design fewer parts may take longer than anticipated. The estimator accounts for simple geometric to "superexotic" forms.
A single screen handles hourly inputs for Part Fabrication/Prototype and Assembly and De-Bug. "Although these tasks will not likely take much time, accounting for them increases accuracy. These sections can also be used to account for tasks not listed in the calculator," he says. The final window shows the estimated total time in hours, days, and weeks.
It takes only a few minutes to input data and results are accurate, according to Samuel. And he says he's open to suggestions. OK. How about a help file with a little more guidance for first time users? And a print feature would be useful to provide users a record.
The software is available free from Design Visionaries Inc. at www.designviz.com, under the Goodies page. They are located at 7034 Calcaterra Dr., San Jose, CA 95210, (408) 997-6323.