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With a wealth of online courses for school districts to choose from, plus an abundance of interactive activities, videos, and digital information to sift through to design such courses, school leaders are embracing a variety of approaches to build online curricula.

Districts are buying online classes from nonprofit and for-profit providers, making their own from scratch, accessing open-source options, or combining all three approaches. Despite often being considered a 鈥渘ew鈥� avenue of education, online-course providers say they鈥檙e tapping years of experience to determine the leading methods of appealing to students and getting them to interact with online material.

鈥淲e鈥檙e always learning what is most effective and what鈥檚 not,鈥� said Cheryl Vedoe, the president and chief executive officer of the virtual-course provider Apex Learning, based in Seattle. 鈥淲e鈥檙e developing a significant body of knowledge from our experience.鈥�

Some research has already given schools and course providers a few guidelines on the hallmarks of a good online curriculum, said Cathy Cavanaugh, an associate professor of educational technology at the University of Florida, in Gainesville. One of the most important aspects of an online course, she said, is a direct connection between strategies and activities in the course and outcomes or goals.

鈥淪ome districts apply an evaluation process to look at whether a course is designed in a way that aligns it toward leading students to accomplish standards,鈥� she said. 鈥淭hat must be a fundamental aspect of the course.鈥�

When it comes to instruction, Ms. Cavanaugh doesn鈥檛 consider an online offering that is solely computer-based, with no teacher support, a true course. 鈥淚t may be interactive and provide digital assessments, but for K-12 students a course must be moderated and mediated by an online teacher,鈥� she said. 鈥淭he instructor is a key element.鈥�

Within an online course, the teacher should play a central role, assessing students, facilitating their engagement and the learning experience, and providing feedback, Ms. Cavanaugh said. There should be a number of ways for students to interact with teachers鈥攅verything from e-mail to Skype and instant messaging.

With both teacher- and computer-based assessments, high-quality online courses should be able to provide more differentiated instruction than a student might get in a face-to-face class, Ms. Cavanaugh said.

Apex is thinking hard about how to meet students on those different levels. Nearly all the company鈥檚 core courses are offered in three versions: advanced, proficient, and a level for students who are struggling to achieve basic literacy.

鈥淲e have really found that the most significant benefit of online learning in a digital curriculum is that it can more easily and effectively address the needs of individual students,鈥� Ms. Vedoe said.

Focus on the Individual

To customize the company鈥檚 curriculum, each version of the same Apex course employs different techniques to reach students, Ms. Vedoe said. In the advanced version, there are more opportunities for students to apply and extend what they鈥檙e learning, and those courses may contain more graded work. The courses aimed at proficient students may have more study sheets, worksheets, and graphic organizers; the literacy-focused courses, while containing much of the same material, may provide more audio of instructional texts, while students read along.

Some philosophies Apex has developed may seem counterintuitive, Ms. Vedoe said. For example, Apex plays down the use of video in some courses aimed at struggling readers, she said.

鈥淭he natural assumption is that if you鈥檙e dealing with at-risk students who have struggled in school, that you want to use more media, video and such, but researchers have found that can be extremely distracting to poor learners,鈥� she said. 鈥淵ou want to get them more focused with fewer distractions.鈥�

Joy Smith, the chief development officer at the Florida Virtual School, or FLVS, based in Orlando, said the state-sponsored school鈥檚 courses offer a variety of paths for students in accessing material contained in an online course.

For instance, a middle school critical-thinking course, designed to enhance students鈥� analytical skills and to impart academic and life skills, allows students to enter as a 鈥渞eader, writer, thinker, or learner,鈥� she said. Though students ultimately must complete each course path鈥攖he thinker path, for example, teaches goal-setting and looking at how to learn from failure鈥攕tudents are permitted to choose the way they go through the online course.

Allowing them to choose makes students feel as if 鈥渢hey have ownership鈥� over their learning, Ms. Smith said. 鈥淲e don鈥檛 tell them what to do. We give them opportunities to pick what they鈥檙e interested in.鈥�

Ms. Smith said FLVS is also doing more project-based learning within courses, using projects that build on each other. For example, a FLVS health course requires students to either create a Web site, commercial, or article that teaches teens about community wellness. Whichever project a student chooses, each activity takes them step by step through the process of creating, say, an article, by coming up with a topic and creating an outline.

Emphasizing project-based learning helps address the issue of academic integrity, so students can鈥檛 copy and paste from Internet sites or look up yes-or-no answers, Ms. Smith said. Though it鈥檚 impossible to completely prevent students from plagiarizing, using project-based learning makes it more difficult than using a multiple-choice assessment that could allow students to search easily for answers, she said.

Designers of FLVS courses also make sure that whether the course is biology or a foreign language, there are certain cohesive components so students consistently feel comfortable with the way material is presented. Tabs run across the top of each course for easy navigation, and most are laid out in a way that Ms. Smith describes as learn, practice, and assess.

The Florida Virtual School emphasizes a 鈥渕ixed鈥� approach to building the courses. The course designers use videos, for example, from the Silver Spring, Md.-based Discovery 91制片厂视频 or try to find other high-quality applications already created and then add their own material.

鈥淥ur first attempt is to find something that we can wrap our instructional strategies around,鈥� Ms. Smith said.

The interactivity of the FLVS courses is also a high priority. Students might be asked to research a topic together and present viewpoints, or they might debate an issue or contribute to group discussions. An Advanced Placement course about the environment, for example, has students plan a 鈥済reen鈥� vacation together, Ms. Smith said.

To better understand what is working or not working in its online courses, Ms. Smith said FLVS makes it a point to survey students regularly. Students are clamoring for ways to use their mobile phones, for instance, so the Florida school is working on embedding opportunities to use smartphones into some courses.

Custom-Built Courses

Though schools often have their students take courses from online schools such as FLVS or purchase courses from companies like Apex, some decide to build their own.

Mary T. Schlegelmilch, the e-learning supervisor for the 46,000-student Omaha, Neb., public schools, said she often focuses on looking for multimedia applications that will pique students鈥� interest. 鈥淲e鈥檙e looking for new creative technology that will engage students in the learning process,鈥� she said.

Ms. Schlegelmilch said the district learned quickly that 鈥測ou can鈥檛 just put worksheets and a textbook online,鈥� particularly when an online course is being developed for students seeking credit recovery to make up for courses they鈥檝e failed.

鈥淚f a student fails in a regular classroom and you give them the same thing again but just online, you鈥檙e not going to get anywhere,鈥� she said.

Elements of a course need to be kept to short, manageable nuggets鈥攏o 50-minute videos, she said.

To build their own courses, district curriculum supervisors in Omaha first look at open-source options, such as the National Repository of Online Courses, a nonprofit group based in Marina, Calif., that provides free, high-quality online courses. Next, they might turn to other organizations鈥攕uch as the National Geographic Society鈥� that offer high-quality materials even though they aren鈥檛 free.

The Omaha district often buys what Ms. Schlegelmilch calls 鈥渓earning objects鈥濃�攁 video, simulation, animation, or podcast鈥攁nd builds a lesson around those objects.

She said many of the textbooks the district already owns have online versions, which also have supplemental materials that can be incorporated into an online course.

Chris Rapp, the former curriculum director at the Boise-based Idaho Digital Learning Academy who now works for the Evergreen 91制片厂视频 Group, said curriculum specialists at the academy build their courses in a similar manner, looking for learning objects that work within the lessons they鈥檙e trying to create.

鈥淲e try to cherry-pick the best stuff,鈥� he said.

He cited a simulation the state-sponsored online school bought from ExploreLearning, a Charlottesville, Va., company that sells simulations aimed at grades 3-12. That simulation mimics a common live lab experiment in which students study the effect of a sprig of seaweed placed into a vial with a snail, compared with a vial containing just a snail. The students put vials in the light and the dark and measure the effect that the oxygen produced by the seaweed has in keeping the snail alive. With the simulation, students can try all the scenarios, but don鈥檛 have to wait days or weeks to see the outcome, Mr. Rapp said.

Much of online-course creation is based on boosting interaction with students, Mr. Rapp said. 鈥淲henever we build a course, we think about how the student is interacting with the content, with the teacher, and with other students,鈥� he said. 鈥淓verything is designed around making those things occur.鈥�

Themistocles Sparangis, the chief technology director for the 680,000-student Los Angeles Unified School District, said his district gets courses from local universities and from Apex Learning, but also creates its own.

The first step in evaluating courses is to make sure they meet the academic standards for California, he said. Mr. Sparangis said he, too, puts an emphasis on feedback and cooperation in online classes. He said online courses can capture a detailed picture of students鈥� participation by examining how often they log in to a course, how much time they spend online,how they progress through the course material, and the extent of their participation in chats, blogs, and wikis.

鈥淚n a traditional classroom, the teacher has to engage in many techniques to monitor engagement: moving around the room, checking student body language, listening to their group conversations,鈥� Mr. Sparangis said. 鈥淚n the online world, I can monitor electronically in much more detail. It鈥檚 a powerful tool.鈥�